diff --git a/app/src/main/java/eu/kanade/presentation/browse/MigrateMangaScreen.kt b/app/src/main/java/eu/kanade/presentation/browse/MigrateMangaScreen.kt
index 0564eca21..716cb50b8 100644
--- a/app/src/main/java/eu/kanade/presentation/browse/MigrateMangaScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/browse/MigrateMangaScreen.kt
@@ -1,35 +1,124 @@
 package eu.kanade.presentation.browse
 
+import androidx.activity.compose.BackHandler
+import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.WindowInsetsSides
+import androidx.compose.foundation.layout.asPaddingValues
+import androidx.compose.foundation.layout.navigationBars
+import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.shape.ZeroCornerSize
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.FindReplace
+import androidx.compose.material.icons.outlined.FlipToBack
+import androidx.compose.material.icons.outlined.SelectAll
+import androidx.compose.material.icons.outlined.VerticalAlignBottom
+import androidx.compose.material.icons.outlined.VerticalAlignTop
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.TopAppBarScrollBehavior
+import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.hapticfeedback.HapticFeedbackType
+import androidx.compose.ui.platform.LocalHapticFeedback
+import androidx.compose.ui.unit.dp
 import eu.kanade.presentation.components.AppBar
+import eu.kanade.presentation.components.AppBarActions
 import eu.kanade.presentation.manga.components.BaseMangaListItem
+import eu.kanade.presentation.manga.components.Button
+import eu.kanade.presentation.util.animateItemFastScroll
+import eu.kanade.tachiyomi.ui.browse.migration.manga.MigrateMangaItem
 import eu.kanade.tachiyomi.ui.browse.migration.manga.MigrateMangaScreenModel
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import tachiyomi.domain.manga.model.Manga
 import tachiyomi.i18n.MR
+import tachiyomi.i18n.kmk.KMR
 import tachiyomi.presentation.core.components.FastScrollLazyColumn
 import tachiyomi.presentation.core.components.material.Scaffold
+import tachiyomi.presentation.core.i18n.stringResource
 import tachiyomi.presentation.core.screens.EmptyScreen
+import kotlin.time.Duration.Companion.seconds
 
 @Composable
 fun MigrateMangaScreen(
     navigateUp: () -> Unit,
-    title: String?,
+    title: String,
     state: MigrateMangaScreenModel.State,
-    onClickItem: (Manga) -> Unit,
+    onClickItem: (MigrateMangaItem) -> Unit,
     onClickCover: (Manga) -> Unit,
+    // KMK -->
+    onMultiMigrateClicked: (() -> Unit),
+    onSelectAll: (Boolean) -> Unit,
+    onInvertSelection: () -> Unit,
+    onMangaSelected: (MigrateMangaItem, Boolean, Boolean, Boolean) -> Unit,
 ) {
+    BackHandler(enabled = state.selectionMode, onBack = { onSelectAll(false) })
+
+    val scope = rememberCoroutineScope()
+    val listState = rememberLazyListState()
+
+    val enableScrollToTop by remember {
+        derivedStateOf {
+            listState.firstVisibleItemIndex > 0
+        }
+    }
+
+    val enableScrollToBottom by remember {
+        derivedStateOf {
+            listState.canScrollForward
+        }
+    }
+    // KMK <--
+
     Scaffold(
         topBar = { scrollBehavior ->
-            AppBar(
+            // KMK -->
+            MigrateMangaAppBar(
                 title = title,
+                itemCnt = state.titles.size,
                 navigateUp = navigateUp,
+                selectedCount = state.selected.size,
+                onClickUnselectAll = { onSelectAll(false) },
+                onClickSelectAll = { onSelectAll(true) },
+                onClickInvertSelection = onInvertSelection,
                 scrollBehavior = scrollBehavior,
             )
         },
+        bottomBar = {
+            MigrateMangaBottomBar(
+                selected = state.selected,
+                onMultiMigrateClicked = onMultiMigrateClicked,
+                enableScrollToTop = enableScrollToTop,
+                enableScrollToBottom = enableScrollToBottom,
+                scrollToTop = {
+                    scope.launch {
+                        listState.scrollToItem(0)
+                    }
+                },
+                scrollToBottom = {
+                    scope.launch {
+                        listState.scrollToItem(state.titles.size - 1)
+                    }
+                },
+                // KMK <--
+            )
+        },
     ) { contentPadding ->
         if (state.isEmpty) {
             EmptyScreen(
@@ -44,6 +133,10 @@ fun MigrateMangaScreen(
             state = state,
             onClickItem = onClickItem,
             onClickCover = onClickCover,
+            // KMK -->
+            onMangaSelected = onMangaSelected,
+            listState = listState,
+            // KMK <--
         )
     }
 }
@@ -52,17 +145,36 @@ fun MigrateMangaScreen(
 private fun MigrateMangaContent(
     contentPadding: PaddingValues,
     state: MigrateMangaScreenModel.State,
-    onClickItem: (Manga) -> Unit,
+    onClickItem: (MigrateMangaItem) -> Unit,
     onClickCover: (Manga) -> Unit,
+    // KMK -->
+    onMangaSelected: (MigrateMangaItem, Boolean, Boolean, Boolean) -> Unit,
+    listState: LazyListState,
 ) {
     FastScrollLazyColumn(
         contentPadding = contentPadding,
+        state = listState,
     ) {
-        items(state.titles) { manga ->
+        // KMK <--
+        items(items = state.titles) {
             MigrateMangaItem(
-                manga = manga,
-                onClickItem = onClickItem,
-                onClickCover = onClickCover,
+                manga = it.manga,
+                onClickItem = {
+                    // KMK -->
+                    when {
+                        state.selectionMode -> onMangaSelected(it, !it.selected, true, false)
+                        // KMK <--
+                        else -> onClickItem(it)
+                    }
+                },
+                onClickCover = {
+                    onClickCover(it.manga)
+                    // KMK -->
+                }.takeIf { !state.selectionMode },
+                onLongClick = { onMangaSelected(it, !it.selected, true, true) },
+                selected = it.selected,
+                modifier = Modifier.animateItemFastScroll(),
+                // KMK <--
             )
         }
     }
@@ -71,14 +183,159 @@ private fun MigrateMangaContent(
 @Composable
 private fun MigrateMangaItem(
     manga: Manga,
-    onClickItem: (Manga) -> Unit,
-    onClickCover: (Manga) -> Unit,
+    onClickItem: () -> Unit,
+    onClickCover: (() -> Unit)?,
+    // KMK -->
+    onLongClick: () -> Unit,
+    selected: Boolean,
+    // KMK <--
     modifier: Modifier = Modifier,
 ) {
     BaseMangaListItem(
         modifier = modifier,
         manga = manga,
-        onClickItem = { onClickItem(manga) },
-        onClickCover = { onClickCover(manga) },
+        onClickItem = onClickItem,
+        onClickCover = { onClickCover?.invoke() },
+        // KMK -->
+        onLongClick = onLongClick,
+        selected = selected,
+        // KMK <--
     )
 }
+
+// KMK -->
+@Composable
+private fun MigrateMangaAppBar(
+    title: String,
+    itemCnt: Int,
+    navigateUp: () -> Unit,
+    selectedCount: Int,
+    onClickUnselectAll: () -> Unit,
+    onClickSelectAll: () -> Unit,
+    onClickInvertSelection: () -> Unit,
+    scrollBehavior: TopAppBarScrollBehavior,
+) {
+    AppBar(
+        title = title,
+        navigateUp = navigateUp,
+        actions = {
+            if (itemCnt > 0) {
+                AppBarActions(
+                    persistentListOf(
+                        AppBar.Action(
+                            title = stringResource(MR.strings.action_select_all),
+                            icon = Icons.Outlined.SelectAll,
+                            onClick = onClickSelectAll,
+                        ),
+                    ),
+                )
+            }
+        },
+        actionModeCounter = selectedCount,
+        onCancelActionMode = onClickUnselectAll,
+        actionModeActions = {
+            AppBarActions(
+                persistentListOf(
+                    AppBar.Action(
+                        title = stringResource(MR.strings.action_select_all),
+                        icon = Icons.Outlined.SelectAll,
+                        onClick = onClickSelectAll,
+                    ),
+                    AppBar.Action(
+                        title = stringResource(MR.strings.action_select_inverse),
+                        icon = Icons.Outlined.FlipToBack,
+                        onClick = onClickInvertSelection,
+                    ),
+                ),
+            )
+        },
+        scrollBehavior = scrollBehavior,
+    )
+}
+
+@Composable
+private fun MigrateMangaBottomBar(
+    modifier: Modifier = Modifier,
+    selected: List<MigrateMangaItem>,
+    onMultiMigrateClicked: (() -> Unit),
+    enableScrollToTop: Boolean,
+    enableScrollToBottom: Boolean,
+    scrollToTop: () -> Unit,
+    scrollToBottom: () -> Unit,
+) {
+    val scope = rememberCoroutineScope()
+    val animatedElevation by animateDpAsState(
+        targetValue = if (selected.isNotEmpty()) 3.dp else 0.dp,
+        label = "elevation",
+    )
+    Surface(
+        modifier = modifier,
+        shape = MaterialTheme.shapes.large.copy(
+            bottomEnd = ZeroCornerSize,
+            bottomStart = ZeroCornerSize,
+        ),
+        color = MaterialTheme.colorScheme.surfaceColorAtElevation(
+            elevation = animatedElevation,
+        ),
+    ) {
+        val haptic = LocalHapticFeedback.current
+        val confirm = remember { mutableStateListOf(false, false, false) }
+        var resetJob: Job? = remember { null }
+        val onLongClickItem: (Int) -> Unit = { toConfirmIndex ->
+            haptic.performHapticFeedback(HapticFeedbackType.LongPress)
+            (0 until 3).forEach { i -> confirm[i] = i == toConfirmIndex }
+            resetJob?.cancel()
+            resetJob = scope.launch {
+                delay(1.seconds)
+                if (isActive) confirm[toConfirmIndex] = false
+            }
+        }
+        Row(
+            modifier = Modifier
+                .padding(
+                    WindowInsets.navigationBars
+                        .only(WindowInsetsSides.Bottom)
+                        .asPaddingValues(),
+                )
+                .padding(horizontal = 8.dp, vertical = 12.dp),
+        ) {
+            Button(
+                title = stringResource(KMR.strings.action_scroll_to_top),
+                icon = Icons.Outlined.VerticalAlignTop,
+                toConfirm = confirm[0],
+                onLongClick = { onLongClickItem(0) },
+                onClick = if (enableScrollToTop) {
+                    scrollToTop
+                } else {
+                    {}
+                },
+                enabled = enableScrollToTop,
+            )
+            Button(
+                title = stringResource(MR.strings.migrate),
+                icon = Icons.Outlined.FindReplace,
+                toConfirm = confirm[1],
+                onLongClick = { onLongClickItem(1) },
+                onClick = if (selected.isNotEmpty()) {
+                    onMultiMigrateClicked
+                } else {
+                    {}
+                },
+                enabled = selected.isNotEmpty(),
+            )
+            Button(
+                title = stringResource(KMR.strings.action_scroll_to_bottom),
+                icon = Icons.Outlined.VerticalAlignBottom,
+                toConfirm = confirm[2],
+                onLongClick = { onLongClickItem(2) },
+                onClick = if (enableScrollToBottom) {
+                    scrollToBottom
+                } else {
+                    {}
+                },
+                enabled = enableScrollToBottom,
+            )
+        }
+    }
+}
+// KMK <--
diff --git a/app/src/main/java/eu/kanade/presentation/browse/MigrateSourceScreen.kt b/app/src/main/java/eu/kanade/presentation/browse/MigrateSourceScreen.kt
index f81183f13..6e74f032b 100644
--- a/app/src/main/java/eu/kanade/presentation/browse/MigrateSourceScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/browse/MigrateSourceScreen.kt
@@ -16,16 +16,15 @@ import androidx.compose.material.icons.outlined.Numbers
 import androidx.compose.material.icons.outlined.SortByAlpha
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
-import androidx.compose.material3.LocalTextStyle
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.style.TextOverflow
 import eu.kanade.domain.source.interactor.SetMigrateSorting
+import eu.kanade.domain.source.model.installedExtension
 import eu.kanade.presentation.browse.components.BaseSourceItem
 import eu.kanade.presentation.browse.components.SourceIcon
 import eu.kanade.presentation.components.AnimatedFloatingSearchBox
@@ -57,9 +56,6 @@ fun MigrateSourceScreen(
     onClickItem: (Source) -> Unit,
     onToggleSortingDirection: () -> Unit,
     onToggleSortingMode: () -> Unit,
-    // SY -->
-    onClickAll: (Source) -> Unit,
-    // SY <--
     // KMK -->
     onChangeSearchQuery: (String?) -> Unit,
     // KMK <--
@@ -87,9 +83,6 @@ fun MigrateSourceScreen(
                 onToggleSortingMode = onToggleSortingMode,
                 sortingDirection = state.sortingDirection,
                 onToggleSortingDirection = onToggleSortingDirection,
-                // SY -->
-                onClickAll = onClickAll,
-                // SY <--
                 // KMK -->
                 state = state,
                 onChangeSearchQuery = onChangeSearchQuery,
@@ -108,9 +101,6 @@ private fun MigrateSourceList(
     onToggleSortingMode: () -> Unit,
     sortingDirection: SetMigrateSorting.Direction,
     onToggleSortingDirection: () -> Unit,
-    // SY -->
-    onClickAll: (Source) -> Unit,
-    // SY <--
     // KMK -->
     state: MigrateSourceScreenModel.State,
     onChangeSearchQuery: (String?) -> Unit,
@@ -199,9 +189,6 @@ private fun MigrateSourceList(
                     count = count,
                     onClickItem = { onClickItem(source) },
                     onLongClickItem = { onLongClickItem(source) },
-                    // SY -->
-                    onClickAll = { onClickAll(source) },
-                    // SY <--
                 )
             }
         }
@@ -214,9 +201,6 @@ private fun MigrateSourceItem(
     count: Long,
     onClickItem: () -> Unit,
     onLongClickItem: () -> Unit,
-    // SY -->
-    onClickAll: () -> Unit,
-    // SY <--
     modifier: Modifier = Modifier,
 ) {
     BaseSourceItem(
@@ -230,16 +214,6 @@ private fun MigrateSourceItem(
             BadgeGroup {
                 Badge(text = "$count")
             }
-            // SY -->
-            TextButton(onClick = onClickAll) {
-                Text(
-                    text = stringResource(MR.strings.all),
-                    style = LocalTextStyle.current.copy(
-                        color = MaterialTheme.colorScheme.primary,
-                    ),
-                )
-            }
-            // SY <--
         },
         content = { _, sourceLangString, /* KMK --> */ lang /* KMK <-- */ ->
             Column(
@@ -276,6 +250,17 @@ private fun MigrateSourceItem(
                             style = MaterialTheme.typography.bodySmall,
                             color = MaterialTheme.colorScheme.error,
                         )
+                        // KMK -->
+                    } else if (source.installedExtension?.isObsolete == true) {
+                        Text(
+                            modifier = Modifier.secondaryItemAlpha(),
+                            text = stringResource(MR.strings.ext_obsolete),
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.error,
+                        )
+                        // KMK <--
                     }
                 }
             }
diff --git a/app/src/main/java/eu/kanade/presentation/libraryUpdateError/LibraryUpdateErrorScreen.kt b/app/src/main/java/eu/kanade/presentation/libraryUpdateError/LibraryUpdateErrorScreen.kt
index d2adc2c51..f4c02f1ef 100644
--- a/app/src/main/java/eu/kanade/presentation/libraryUpdateError/LibraryUpdateErrorScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/libraryUpdateError/LibraryUpdateErrorScreen.kt
@@ -1,26 +1,14 @@
 package eu.kanade.presentation.libraryUpdateError
 
 import androidx.activity.compose.BackHandler
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.animateColorAsState
-import androidx.compose.animation.core.animateFloatAsState
-import androidx.compose.animation.expandVertically
-import androidx.compose.animation.fadeIn
-import androidx.compose.animation.fadeOut
-import androidx.compose.animation.shrinkVertically
-import androidx.compose.foundation.combinedClickable
-import androidx.compose.foundation.interaction.MutableInteractionSource
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
+import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.WindowInsetsSides
 import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.ZeroCornerSize
 import androidx.compose.material.icons.Icons
@@ -31,12 +19,10 @@ import androidx.compose.material.icons.outlined.FlipToBack
 import androidx.compose.material.icons.outlined.SelectAll
 import androidx.compose.material.icons.outlined.VerticalAlignBottom
 import androidx.compose.material.icons.outlined.VerticalAlignTop
-import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBarScrollBehavior
-import androidx.compose.material3.ripple
+import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
@@ -45,16 +31,14 @@ import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.hapticfeedback.HapticFeedbackType
 import androidx.compose.ui.platform.LocalHapticFeedback
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import eu.kanade.presentation.components.AppBar
 import eu.kanade.presentation.components.AppBarActions
 import eu.kanade.presentation.libraryUpdateError.components.libraryUpdateErrorUiItems
+import eu.kanade.presentation.manga.components.Button
 import eu.kanade.tachiyomi.ui.libraryUpdateError.LibraryUpdateErrorItem
 import eu.kanade.tachiyomi.ui.libraryUpdateError.LibraryUpdateErrorScreenState
 import kotlinx.collections.immutable.persistentListOf
@@ -74,7 +58,6 @@ import kotlin.time.Duration.Companion.seconds
 @Composable
 fun LibraryUpdateErrorScreen(
     state: LibraryUpdateErrorScreenState,
-    modifier: Modifier = Modifier,
     onClick: (LibraryUpdateErrorItem) -> Unit,
     onClickCover: (LibraryUpdateErrorItem) -> Unit,
     onMultiMigrateClicked: (() -> Unit),
@@ -83,8 +66,15 @@ fun LibraryUpdateErrorScreen(
     onErrorSelected: (LibraryUpdateErrorItem, Boolean, Boolean, Boolean) -> Unit,
     navigateUp: () -> Unit,
 ) {
-    val listState = rememberLazyListState()
+    BackHandler(enabled = state.selectionMode, onBack = { onSelectAll(false) })
+
     val scope = rememberCoroutineScope()
+    val listState = rememberLazyListState()
+
+    val headerIndexes = remember { mutableStateOf<List<Int>>(emptyList()) }
+    LaunchedEffect(state) {
+        headerIndexes.value = state.getHeaderIndexes()
+    }
 
     val enableScrollToTop by remember {
         derivedStateOf {
@@ -98,10 +88,6 @@ fun LibraryUpdateErrorScreen(
         }
     }
 
-    val headerIndexes = remember { mutableStateOf<List<Int>>(emptyList()) }
-    LaunchedEffect(state) {
-        headerIndexes.value = state.getHeaderIndexes()
-    }
     val enableScrollToPrevious by remember {
         derivedStateOf {
             headerIndexes.value.any { it < listState.firstVisibleItemIndex }
@@ -113,11 +99,9 @@ fun LibraryUpdateErrorScreen(
         }
     }
 
-    BackHandler(enabled = state.selectionMode, onBack = { onSelectAll(false) })
-
     Scaffold(
         topBar = { scrollBehavior ->
-            LibraryUpdateErrorsAppBar(
+            LibraryUpdateErrorAppBar(
                 title = stringResource(
                     KMR.strings.label_library_update_errors,
                     state.items.size,
@@ -132,8 +116,7 @@ fun LibraryUpdateErrorScreen(
             )
         },
         bottomBar = {
-            LibraryUpdateErrorsBottomBar(
-                modifier = modifier,
+            LibraryUpdateErrorBottomBar(
                 selected = state.selected,
                 onMultiMigrateClicked = onMultiMigrateClicked,
                 enableScrollToTop = enableScrollToTop,
@@ -198,7 +181,7 @@ fun LibraryUpdateErrorScreen(
 }
 
 @Composable
-private fun LibraryUpdateErrorsBottomBar(
+private fun LibraryUpdateErrorBottomBar(
     modifier: Modifier = Modifier,
     selected: List<LibraryUpdateErrorItem>,
     onMultiMigrateClicked: (() -> Unit),
@@ -212,13 +195,19 @@ private fun LibraryUpdateErrorsBottomBar(
     scrollToNext: () -> Unit,
 ) {
     val scope = rememberCoroutineScope()
+    val animatedElevation by animateDpAsState(
+        targetValue = if (selected.isNotEmpty()) 3.dp else 0.dp,
+        label = "elevation",
+    )
     Surface(
         modifier = modifier,
         shape = MaterialTheme.shapes.large.copy(
             bottomEnd = ZeroCornerSize,
             bottomStart = ZeroCornerSize,
         ),
-        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        color = MaterialTheme.colorScheme.surfaceColorAtElevation(
+            elevation = animatedElevation,
+        ),
     ) {
         val haptic = LocalHapticFeedback.current
         val confirm = remember { mutableStateListOf(false, false, false, false, false) }
@@ -306,62 +295,7 @@ private fun LibraryUpdateErrorsBottomBar(
 }
 
 @Composable
-private fun RowScope.Button(
-    title: String,
-    icon: ImageVector,
-    toConfirm: Boolean,
-    enabled: Boolean,
-    onLongClick: () -> Unit,
-    onClick: (() -> Unit),
-    content: (@Composable () -> Unit)? = null,
-) {
-    val animatedWeight by animateFloatAsState(if (toConfirm) 2f else 1f)
-    val animatedColor by animateColorAsState(
-        if (enabled) {
-            MaterialTheme.colorScheme.onSurface
-        } else {
-            MaterialTheme.colorScheme.onSurface.copy(
-                alpha = 0.38f,
-            )
-        },
-    )
-    Column(
-        modifier = Modifier
-            .size(48.dp)
-            .weight(animatedWeight)
-            .combinedClickable(
-                interactionSource = remember { MutableInteractionSource() },
-                indication = ripple(bounded = false),
-                onLongClick = onLongClick,
-                onClick = onClick,
-            ),
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally,
-    ) {
-        Icon(
-            imageVector = icon,
-            contentDescription = title,
-            tint = animatedColor,
-        )
-        AnimatedVisibility(
-            visible = toConfirm,
-            enter = expandVertically(expandFrom = Alignment.Top) + fadeIn(),
-            exit = shrinkVertically(shrinkTowards = Alignment.Top) + fadeOut(),
-        ) {
-            Text(
-                text = title,
-                overflow = TextOverflow.Visible,
-                maxLines = 1,
-                style = MaterialTheme.typography.labelSmall,
-                color = animatedColor,
-            )
-        }
-        content?.invoke()
-    }
-}
-
-@Composable
-private fun LibraryUpdateErrorsAppBar(
+private fun LibraryUpdateErrorAppBar(
     title: String,
     itemCnt: Int,
     navigateUp: () -> Unit,
diff --git a/app/src/main/java/eu/kanade/presentation/manga/components/BaseMangaListItem.kt b/app/src/main/java/eu/kanade/presentation/manga/components/BaseMangaListItem.kt
index 652fb87d3..16281868a 100644
--- a/app/src/main/java/eu/kanade/presentation/manga/components/BaseMangaListItem.kt
+++ b/app/src/main/java/eu/kanade/presentation/manga/components/BaseMangaListItem.kt
@@ -1,6 +1,6 @@
 package eu.kanade.presentation.manga.components
 
-import androidx.compose.foundation.clickable
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
@@ -12,10 +12,13 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.hapticfeedback.HapticFeedbackType
+import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import tachiyomi.domain.manga.model.Manga
 import tachiyomi.presentation.core.components.material.padding
+import tachiyomi.presentation.core.util.selectedBackground
 
 @Composable
 fun BaseMangaListItem(
@@ -23,13 +26,31 @@ fun BaseMangaListItem(
     modifier: Modifier = Modifier,
     onClickItem: () -> Unit = {},
     onClickCover: () -> Unit = onClickItem,
+    // KMK -->
+    onLongClick: () -> Unit = onClickItem,
+    selected: Boolean,
+    // KMK <--
     cover: @Composable RowScope.() -> Unit = { defaultCover(manga, onClickCover) },
     actions: @Composable RowScope.() -> Unit = {},
     content: @Composable RowScope.() -> Unit = { defaultContent(manga) },
 ) {
+    // KMK -->
+    val haptic = LocalHapticFeedback.current
+    // KMK <--
     Row(
         modifier = modifier
-            .clickable(onClick = onClickItem)
+            // KMK -->
+            .selectedBackground(selected)
+            .combinedClickable(
+                // KMK <--
+                onClick = onClickItem,
+                // KMK -->
+                onLongClick = {
+                    onLongClick()
+                    haptic.performHapticFeedback(HapticFeedbackType.LongPress)
+                },
+                // KMK <--
+            )
             .height(56.dp)
             .padding(horizontal = MaterialTheme.padding.medium),
         verticalAlignment = Alignment.CenterVertically,
diff --git a/app/src/main/java/eu/kanade/presentation/manga/components/MangaBottomActionMenu.kt b/app/src/main/java/eu/kanade/presentation/manga/components/MangaBottomActionMenu.kt
index 60a845069..28301a5c2 100644
--- a/app/src/main/java/eu/kanade/presentation/manga/components/MangaBottomActionMenu.kt
+++ b/app/src/main/java/eu/kanade/presentation/manga/components/MangaBottomActionMenu.kt
@@ -1,6 +1,7 @@
 package eu.kanade.presentation.manga.components
 
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.expandVertically
@@ -182,18 +183,33 @@ fun MangaBottomActionMenu(
 }
 
 @Composable
-private fun RowScope.Button(
+internal fun RowScope.Button(
     title: String,
     icon: ImageVector,
     toConfirm: Boolean,
     onLongClick: () -> Unit,
     onClick: () -> Unit,
+    // KMK -->
+    enabled: Boolean = true,
+    // KMK <--
     content: (@Composable () -> Unit)? = null,
 ) {
     val animatedWeight by animateFloatAsState(
         targetValue = if (toConfirm) 2f else 1f,
         label = "weight",
     )
+    // KMK -->
+    val animatedColor by animateColorAsState(
+        if (enabled) {
+            MaterialTheme.colorScheme.onSurface
+        } else {
+            MaterialTheme.colorScheme.onSurface.copy(
+                alpha = 0.38f,
+            )
+        },
+        label = "color",
+    )
+    // KMK <--
     Column(
         modifier = Modifier
             .size(48.dp)
@@ -210,6 +226,9 @@ private fun RowScope.Button(
         Icon(
             imageVector = icon,
             contentDescription = title,
+            // KMK -->
+            tint = animatedColor,
+            // KMK <--
         )
         AnimatedVisibility(
             visible = toConfirm,
@@ -221,6 +240,9 @@ private fun RowScope.Button(
                 overflow = TextOverflow.Visible,
                 maxLines = 1,
                 style = MaterialTheme.typography.labelSmall,
+                // KMK -->
+                color = animatedColor,
+                // KMK <--
             )
         }
         content?.invoke()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/design/PreMigrationScreen.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/design/PreMigrationScreen.kt
index 2ead0a30a..0210bf564 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/design/PreMigrationScreen.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/design/PreMigrationScreen.kt
@@ -2,36 +2,69 @@ package eu.kanade.tachiyomi.ui.browse.migration.advanced.design
 
 import android.view.LayoutInflater
 import androidx.activity.compose.BackHandler
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.background
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.WindowInsetsSides
+import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBars
+import androidx.compose.foundation.layout.only
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.ZeroCornerSize
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.outlined.ArrowForward
 import androidx.compose.material.icons.outlined.Deselect
+import androidx.compose.material.icons.outlined.PushPin
 import androidx.compose.material.icons.outlined.SelectAll
+import androidx.compose.material.icons.outlined.ToggleOn
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.rememberTopAppBarState
+import androidx.compose.material3.ripple
+import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.hapticfeedback.HapticFeedbackType
 import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
 import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.platform.LocalLayoutDirection
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Velocity
+import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.view.ViewCompat
 import androidx.core.view.updatePadding
@@ -41,13 +74,15 @@ import cafe.adriel.voyager.navigator.LocalNavigator
 import cafe.adriel.voyager.navigator.Navigator
 import cafe.adriel.voyager.navigator.currentOrThrow
 import eu.kanade.presentation.components.AppBar
-import eu.kanade.presentation.components.AppBarActions
 import eu.kanade.presentation.components.SourcesSearchBox
 import eu.kanade.presentation.util.Screen
 import eu.kanade.tachiyomi.databinding.PreMigrationListBinding
 import eu.kanade.tachiyomi.ui.browse.migration.advanced.process.MigrationListScreen
 import eu.kanade.tachiyomi.ui.browse.migration.advanced.process.MigrationProcedureConfig
-import kotlinx.collections.immutable.persistentListOf
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import tachiyomi.i18n.MR
 import tachiyomi.i18n.kmk.KMR
 import tachiyomi.i18n.sy.SYMR
@@ -57,6 +92,7 @@ import tachiyomi.presentation.core.components.material.padding
 import tachiyomi.presentation.core.i18n.stringResource
 import java.io.Serializable
 import kotlin.math.roundToInt
+import kotlin.time.Duration.Companion.seconds
 
 sealed class MigrationType : Serializable {
     data class MangaList(val mangaIds: List<Long>) : MigrationType()
@@ -125,32 +161,19 @@ class PreMigrationScreen(val migration: MigrationType) : Screen() {
                     title = stringResource(SYMR.strings.select_sources),
                     navigateUp = navigator::pop,
                     scrollBehavior = scrollBehavior,
-                    actions = {
-                        AppBarActions(
-                            persistentListOf(
-                                AppBar.Action(
-                                    title = stringResource(SYMR.strings.select_none),
-                                    icon = Icons.Outlined.Deselect,
-                                    onClick = { screenModel.massSelect(false) },
-                                ),
-                                AppBar.Action(
-                                    title = stringResource(MR.strings.action_select_all),
-                                    icon = Icons.Outlined.SelectAll,
-                                    onClick = { screenModel.massSelect(true) },
-                                ),
-                                AppBar.OverflowAction(
-                                    title = stringResource(SYMR.strings.match_enabled_sources),
-                                    onClick = { screenModel.matchSelection(true) },
-                                ),
-                                AppBar.OverflowAction(
-                                    title = stringResource(SYMR.strings.match_pinned_sources),
-                                    onClick = { screenModel.matchSelection(false) },
-                                ),
-                            ),
-                        )
-                    },
                 )
             },
+            // KMK -->
+            bottomBar = {
+                PreMigrationScreenBottomBar(
+                    modifier = Modifier,
+                    onSelectAll = { screenModel.massSelect(true) },
+                    onSelectNone = { screenModel.massSelect(false) },
+                    onSelectPinned = { screenModel.matchSelection(false) },
+                    onSelectEnabled = { screenModel.matchSelection(true) },
+                )
+            },
+            // KMK <--
             floatingActionButton = {
                 ExtendedFloatingActionButton(
                     text = { Text(text = stringResource(MR.strings.action_migrate)) },
@@ -234,6 +257,124 @@ class PreMigrationScreen(val migration: MigrationType) : Screen() {
         }
     }
 
+    // KMK -->
+    @Composable
+    fun PreMigrationScreenBottomBar(
+        modifier: Modifier,
+        onSelectAll: () -> Unit,
+        onSelectNone: () -> Unit,
+        onSelectPinned: () -> Unit,
+        onSelectEnabled: () -> Unit,
+    ) {
+        val scope = rememberCoroutineScope()
+        Surface(
+            modifier = modifier,
+            shape = MaterialTheme.shapes.large.copy(
+                bottomEnd = ZeroCornerSize,
+                bottomStart = ZeroCornerSize,
+            ),
+            color = MaterialTheme.colorScheme.surfaceColorAtElevation(elevation = 0.dp),
+        ) {
+            val haptic = LocalHapticFeedback.current
+            val confirm = remember { mutableStateListOf(false, false, false, false) }
+            var resetJob: Job? = remember { null }
+            val onLongClickItem: (Int) -> Unit = { toConfirmIndex ->
+                haptic.performHapticFeedback(HapticFeedbackType.LongPress)
+                (0 until 4).forEach { i -> confirm[i] = i == toConfirmIndex }
+                resetJob?.cancel()
+                resetJob = scope.launch {
+                    delay(1.seconds)
+                    if (isActive) confirm[toConfirmIndex] = false
+                }
+            }
+            Row(
+                modifier = Modifier
+                    .padding(
+                        WindowInsets.navigationBars
+                            .only(WindowInsetsSides.Bottom)
+                            .asPaddingValues(),
+                    )
+                    .padding(horizontal = 8.dp, vertical = 12.dp),
+            ) {
+                Button(
+                    title = stringResource(MR.strings.action_select_all),
+                    icon = Icons.Outlined.SelectAll,
+                    onClick = onSelectAll,
+                    toConfirm = confirm[0],
+                    onLongClick = { onLongClickItem(0) },
+                )
+                Button(
+                    title = stringResource(SYMR.strings.select_none),
+                    icon = Icons.Outlined.Deselect,
+                    onClick = onSelectNone,
+                    toConfirm = confirm[1],
+                    onLongClick = { onLongClickItem(1) },
+                )
+                Button(
+                    title = stringResource(SYMR.strings.match_enabled_sources),
+                    icon = Icons.Outlined.ToggleOn,
+                    onClick = onSelectEnabled,
+                    toConfirm = confirm[2],
+                    onLongClick = { onLongClickItem(2) },
+                )
+                Button(
+                    title = stringResource(SYMR.strings.match_pinned_sources),
+                    icon = Icons.Outlined.PushPin,
+                    onClick = onSelectPinned,
+                    toConfirm = confirm[3],
+                    onLongClick = { onLongClickItem(3) },
+                )
+            }
+        }
+    }
+
+    @Composable
+    private fun RowScope.Button(
+        title: String,
+        icon: ImageVector,
+        toConfirm: Boolean,
+        onLongClick: () -> Unit,
+        onClick: (() -> Unit),
+        content: (@Composable () -> Unit)? = null,
+    ) {
+        val animatedWeight by animateFloatAsState(
+            targetValue = if (toConfirm) 2f else 1f,
+            label = "weight",
+        )
+        Column(
+            modifier = Modifier
+                .size(48.dp)
+                .weight(animatedWeight)
+                .combinedClickable(
+                    interactionSource = remember { MutableInteractionSource() },
+                    indication = ripple(bounded = false),
+                    onLongClick = onLongClick,
+                    onClick = onClick,
+                ),
+            verticalArrangement = Arrangement.Center,
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Icon(
+                imageVector = icon,
+                contentDescription = title,
+            )
+            AnimatedVisibility(
+                visible = toConfirm,
+                enter = expandVertically(expandFrom = Alignment.Top) + fadeIn(),
+                exit = shrinkVertically(shrinkTowards = Alignment.Top) + fadeOut(),
+            ) {
+                Text(
+                    text = title,
+                    overflow = TextOverflow.Visible,
+                    textAlign = TextAlign.Center,
+                    style = MaterialTheme.typography.labelSmall,
+                )
+            }
+            content?.invoke()
+        }
+    }
+    // KMK <--
+
     companion object {
         fun navigateToMigration(skipPre: Boolean, navigator: Navigator, mangaIds: List<Long>) {
             navigator.push(
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreen.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreen.kt
index d2b978354..b5da1d691 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreen.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreen.kt
@@ -16,6 +16,7 @@ import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.flow.collectLatest
 import tachiyomi.domain.UnsortedPreferences
 import tachiyomi.i18n.MR
+import tachiyomi.i18n.kmk.KMR
 import tachiyomi.presentation.core.screens.LoadingScreen
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
@@ -39,18 +40,39 @@ data class MigrateMangaScreen(
 
         MigrateMangaScreen(
             navigateUp = navigator::pop,
-            title = state.source!!.name,
+            title = state.source?.name ?: "???",
             state = state,
             onClickItem = {
                 // SY -->
                 PreMigrationScreen.navigateToMigration(
                     Injekt.get<UnsortedPreferences>().skipPreMigration().get(),
                     navigator,
-                    listOf(it.id),
+                    listOf(it.manga.id),
                 )
                 // SY <--
             },
             onClickCover = { navigator.push(MangaScreen(it.id)) },
+            // KMK -->
+            onMultiMigrateClicked = {
+                if (state.selectionMode) {
+                    PreMigrationScreen.navigateToMigration(
+                        Injekt.get<UnsortedPreferences>().skipPreMigration().get(),
+                        navigator,
+                        state.selected.map { it.manga.id },
+                    )
+                } else {
+                    context.toast(KMR.strings.migrating_all_entries)
+                    PreMigrationScreen.navigateToMigration(
+                        Injekt.get<UnsortedPreferences>().skipPreMigration().get(),
+                        navigator,
+                        state.titles.map { it.manga.id },
+                    )
+                }
+            },
+            onSelectAll = screenModel::toggleAllSelection,
+            onInvertSelection = screenModel::invertSelection,
+            onMangaSelected = screenModel::toggleSelection,
+            // KMK <--
         )
 
         LaunchedEffect(Unit) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreenModel.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreenModel.kt
index 8faf1c320..896581d9e 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreenModel.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrateMangaScreenModel.kt
@@ -3,6 +3,7 @@ package eu.kanade.tachiyomi.ui.browse.migration.manga
 import androidx.compose.runtime.Immutable
 import cafe.adriel.voyager.core.model.StateScreenModel
 import cafe.adriel.voyager.core.model.screenModelScope
+import eu.kanade.core.util.addOrRemove
 import eu.kanade.tachiyomi.source.Source
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
@@ -32,6 +33,12 @@ class MigrateMangaScreenModel(
     private val _events: Channel<MigrationMangaEvent> = Channel()
     val events: Flow<MigrationMangaEvent> = _events.receiveAsFlow()
 
+    // KMK -->
+    // First and last selected index in list
+    private val selectedPositions: Array<Int> = arrayOf(-1, -1)
+    private val selectedMangaIds: HashSet<Long> = HashSet()
+    // KMK <--
+
     init {
         screenModelScope.launch {
             mutableState.update { state ->
@@ -46,9 +53,14 @@ class MigrateMangaScreenModel(
                         state.copy(titleList = persistentListOf())
                     }
                 }
+                // KMK -->
+                .map { manga ->
+                    toMigrationMangaScreenItems(manga)
+                }
+                // KMK <--
                 .map { manga ->
                     manga
-                        .sortedWith(compareBy(String.CASE_INSENSITIVE_ORDER) { it.title })
+                        .sortedWith(compareBy(String.CASE_INSENSITIVE_ORDER) { it.manga.title })
                         .toImmutableList()
                 }
                 .collectLatest { list ->
@@ -57,13 +69,117 @@ class MigrateMangaScreenModel(
         }
     }
 
+    // KMK -->
+    private fun toMigrationMangaScreenItems(mangas: List<Manga>): List<MigrateMangaItem> {
+        return mangas.map { manga ->
+            MigrateMangaItem(
+                manga = manga,
+                selected = manga.id in selectedMangaIds,
+            )
+        }
+    }
+
+    fun toggleSelection(
+        item: MigrateMangaItem,
+        selected: Boolean,
+        userSelected: Boolean = false,
+        fromLongPress: Boolean = false,
+    ) {
+        mutableState.update { state ->
+            val newItems = state.titles.toMutableList().apply {
+                val selectedIndex = indexOfFirst { it.manga.id == item.manga.id }
+                if (selectedIndex < 0) return@apply
+
+                val selectedItem = get(selectedIndex)
+                if (selectedItem.selected == selected) return@apply
+
+                val firstSelection = none { it.selected }
+                set(selectedIndex, selectedItem.copy(selected = selected))
+                selectedMangaIds.addOrRemove(item.manga.id, selected)
+
+                if (selected && userSelected && fromLongPress) {
+                    if (firstSelection) {
+                        selectedPositions[0] = selectedIndex
+                        selectedPositions[1] = selectedIndex
+                    } else {
+                        // Try to select the items in-between when possible
+                        val range: IntRange
+                        if (selectedIndex < selectedPositions[0]) {
+                            range = selectedIndex + 1 until selectedPositions[0]
+                            selectedPositions[0] = selectedIndex
+                        } else if (selectedIndex > selectedPositions[1]) {
+                            range = (selectedPositions[1] + 1) until selectedIndex
+                            selectedPositions[1] = selectedIndex
+                        } else {
+                            // Just select itself
+                            range = IntRange.EMPTY
+                        }
+
+                        range.forEach {
+                            val inBetweenItem = get(it)
+                            if (!inBetweenItem.selected) {
+                                selectedMangaIds.add(inBetweenItem.manga.id)
+                                set(it, inBetweenItem.copy(selected = true))
+                            }
+                        }
+                    }
+                } else if (userSelected && !fromLongPress) {
+                    if (!selected) {
+                        if (selectedIndex == selectedPositions[0]) {
+                            selectedPositions[0] = indexOfFirst { it.selected }
+                        } else if (selectedIndex == selectedPositions[1]) {
+                            selectedPositions[1] = indexOfLast { it.selected }
+                        }
+                    } else {
+                        if (selectedIndex < selectedPositions[0]) {
+                            selectedPositions[0] = selectedIndex
+                        } else if (selectedIndex > selectedPositions[1]) {
+                            selectedPositions[1] = selectedIndex
+                        }
+                    }
+                }
+            }
+            state.copy(titleList = newItems.toImmutableList())
+        }
+    }
+
+    fun toggleAllSelection(selected: Boolean) {
+        mutableState.update { state ->
+            val newItems = state.titles.map {
+                selectedMangaIds.addOrRemove(it.manga.id, selected)
+                it.copy(selected = selected)
+            }
+            state.copy(titleList = newItems.toImmutableList())
+        }
+
+        selectedPositions[0] = -1
+        selectedPositions[1] = -1
+    }
+
+    fun invertSelection() {
+        mutableState.update { state ->
+            val newItems = state.titles.map {
+                selectedMangaIds.addOrRemove(it.manga.id, !it.selected)
+                it.copy(selected = !it.selected)
+            }
+            state.copy(titleList = newItems.toImmutableList())
+        }
+        selectedPositions[0] = -1
+        selectedPositions[1] = -1
+    }
+    // KMK <--
+
     @Immutable
     data class State(
         val source: Source? = null,
-        private val titleList: ImmutableList<Manga>? = null,
+        private val titleList: ImmutableList<MigrateMangaItem>? = null,
     ) {
+        // KMK -->
+        val selected = titles.filter { it.selected }
+        val selectionMode = selected.isNotEmpty()
+        // KMK <--
 
-        val titles: ImmutableList<Manga>
+        val titles: ImmutableList<MigrateMangaItem>
             get() = titleList ?: persistentListOf()
 
         val isLoading: Boolean
@@ -77,3 +193,11 @@ class MigrateMangaScreenModel(
 sealed interface MigrationMangaEvent {
     data object FailedFetchingFavorites : MigrationMangaEvent
 }
+
+// KMK -->
+@Immutable
+data class MigrateMangaItem(
+    val manga: Manga,
+    val selected: Boolean,
+)
+// KMK <--
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/sources/MigrateSourceTab.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/sources/MigrateSourceTab.kt
index 563dff586..e07d49c68 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/sources/MigrateSourceTab.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/sources/MigrateSourceTab.kt
@@ -13,18 +13,10 @@ import cafe.adriel.voyager.navigator.currentOrThrow
 import eu.kanade.presentation.browse.MigrateSourceScreen
 import eu.kanade.presentation.components.AppBar
 import eu.kanade.presentation.components.TabContent
-import eu.kanade.tachiyomi.ui.browse.migration.advanced.design.PreMigrationScreen
 import eu.kanade.tachiyomi.ui.browse.migration.manga.MigrateMangaScreen
 import kotlinx.collections.immutable.persistentListOf
-import kotlinx.coroutines.DelicateCoroutinesApi
-import tachiyomi.core.common.util.lang.launchIO
-import tachiyomi.core.common.util.lang.withUIContext
-import tachiyomi.domain.UnsortedPreferences
-import tachiyomi.domain.manga.interactor.GetFavorites
 import tachiyomi.i18n.MR
 import tachiyomi.presentation.core.i18n.stringResource
-import uy.kohesive.injekt.Injekt
-import uy.kohesive.injekt.api.get
 
 @Composable
 fun Screen.migrateSourceTab(): TabContent {
@@ -53,24 +45,6 @@ fun Screen.migrateSourceTab(): TabContent {
                 },
                 onToggleSortingDirection = screenModel::toggleSortingDirection,
                 onToggleSortingMode = screenModel::toggleSortingMode,
-                // SY -->
-                onClickAll = { source ->
-                    // TODO: Jay wtf, need to clean this up sometime
-                    @OptIn(DelicateCoroutinesApi::class)
-                    launchIO {
-                        val manga = Injekt.get<GetFavorites>().await()
-                        val sourceMangas =
-                            manga.asSequence().filter { it.source == source.id }.map { it.id }.toList()
-                        withUIContext {
-                            PreMigrationScreen.navigateToMigration(
-                                Injekt.get<UnsortedPreferences>().skipPreMigration().get(),
-                                navigator,
-                                sourceMangas,
-                            )
-                        }
-                    }
-                },
-                // SY <--
                 // KMK -->
                 onChangeSearchQuery = screenModel::search,
                 // KMK <--
diff --git a/i18n-kmk/src/commonMain/moko-resources/base/strings.xml b/i18n-kmk/src/commonMain/moko-resources/base/strings.xml
index 7d2cf9e07..e8c3d11c5 100644
--- a/i18n-kmk/src/commonMain/moko-resources/base/strings.xml
+++ b/i18n-kmk/src/commonMain/moko-resources/base/strings.xml
@@ -151,6 +151,7 @@
 
     <!-- Migration -->
     <string name="current_">Current: %1$s</string>
+    <string name="migrating_all_entries">Migrating all entries from source</string>
 
     <!-- Misc -->
     <string name="label_to_be_updated">To be updated</string>