diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/CardBrowser.kt b/AnkiDroid/src/main/java/com/ichi2/anki/CardBrowser.kt
index c3005cbf5102..45017bfc778f 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/CardBrowser.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/CardBrowser.kt
@@ -117,7 +117,7 @@ open class CardBrowser :
     }
 
     override var fragmented: Boolean
-        get() = viewModel.isFragmented
+        get() = Prefs.showSplitView && viewModel.isFragmented
         set(_) {
             throw UnsupportedOperationException()
         }
@@ -235,7 +235,8 @@ open class CardBrowser :
          */
         // TODO: Consider refactoring by storing noteEditorFrame and similar views in a sealed class (e.g., FragmentAccessor).
         val fragmented =
-            Prefs.devIsCardBrowserFragmented &&
+            Prefs.showSplitView &&
+                Prefs.devIsCardBrowserFragmented &&
                 !useSearchView &&
                 binding.noteEditorFrame?.visibility == View.VISIBLE
         Timber.i("Using split Browser: %b", fragmented)
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/CardTemplateEditor.kt b/AnkiDroid/src/main/java/com/ichi2/anki/CardTemplateEditor.kt
index a5f2a31ae2e1..d013f88d25a0 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/CardTemplateEditor.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/CardTemplateEditor.kt
@@ -218,7 +218,7 @@ open class CardTemplateEditor : AnkiActivity(R.layout.activity_card_template_edi
             tempNoteType = CardTemplateNotetype.fromBundle(savedInstanceState)
         }
 
-        fragmented = binding.fragmentContainer?.isVisible == true
+        fragmented = Prefs.showSplitView && binding.fragmentContainer?.isVisible == true
 
         setNavigationBarColor(R.attr.alternativeBackgroundColor)
 
@@ -236,6 +236,9 @@ open class CardTemplateEditor : AnkiActivity(R.layout.activity_card_template_edi
                 leftPaneWeightKey = PREF_TEMPLATE_EDITOR_PANE_WEIGHT,
                 rightPaneWeightKey = PREF_TEMPLATE_PREVIEWER_PANE_WEIGHT,
             )
+        } else {
+            binding.fragmentContainer?.isVisible = false
+            binding.cardTemplateEditorResizingDivider?.isVisible = false
         }
 
         // Open TemplatePreviewerFragment if in fragmented mode
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt b/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt
index 5ed72983f2a6..6501ad184859 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/DeckPicker.kt
@@ -28,7 +28,6 @@ package com.ichi2.anki
 import android.content.Context
 import android.content.Intent
 import android.content.SharedPreferences
-import android.content.res.Configuration
 import android.database.SQLException
 import android.graphics.Color
 import android.graphics.PixelFormat
@@ -39,6 +38,7 @@ import android.view.KeyEvent
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import android.view.ViewGroup
 import android.view.ViewGroup.MarginLayoutParams
 import android.widget.TextView
 import androidx.activity.OnBackPressedCallback
@@ -276,8 +276,8 @@ open class DeckPicker :
 
     override var fragmented: Boolean
         get() =
-            resources.configuration.screenLayout and Configuration.SCREENLAYOUT_SIZE_MASK ==
-                Configuration.SCREENLAYOUT_SIZE_XLARGE
+            Prefs.showSplitView &&
+                resources.configuration.screenWidthDp >= 840
         set(_) = throw UnsupportedOperationException()
 
     // Short animation duration from system
@@ -509,6 +509,18 @@ open class DeckPicker :
         }
 
         setViewBinding(binding)
+        if (!fragmented) {
+            binding.studyoptionsFragment?.isVisible = false
+            binding.resizingDivider?.isVisible = false
+            // Ensure the deck picker pane fills the full width
+            deckPickerBinding.root.let { pane ->
+                (pane.layoutParams as? android.widget.LinearLayout.LayoutParams)?.let {
+                    it.width = ViewGroup.LayoutParams.MATCH_PARENT
+                    it.weight = 0f
+                    pane.layoutParams = it
+                }
+            }
+        }
         enableToolbar()
         // TODO This method is run on every activity recreation, which can happen often.
         //  It seems that the original idea was for for this to only run once, on app start.
@@ -770,7 +782,7 @@ open class DeckPicker :
         }
 
         fun onResizingDividerVisibilityChanged(isVisible: Boolean) {
-            binding.resizingDivider?.isVisible = isVisible
+            binding.resizingDivider?.isVisible = isVisible && fragmented
         }
 
         fun onCardsDueChanged(dueCount: Int?) {
@@ -1946,6 +1958,11 @@ open class DeckPicker :
      * @return whether the panel was shown
      */
     private fun tryShowStudyOptionsPanel(): Boolean {
+        if (!fragmented) {
+            binding.studyoptionsFragment?.isVisible = false
+            binding.resizingDivider?.isVisible = false
+            return false
+        }
         val containerId = binding.studyoptionsFragment?.id ?: return false
         supportFragmentManager.commit {
             replace(containerId, StudyOptionsFragment())
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/NoteEditorActivity.kt b/AnkiDroid/src/main/java/com/ichi2/anki/NoteEditorActivity.kt
index 0feb1f7c6f97..53c75edb9f63 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/NoteEditorActivity.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/NoteEditorActivity.kt
@@ -77,7 +77,7 @@ class NoteEditorActivity :
     private var refreshPreviewerJob: Job? = null
 
     val fragmented: Boolean
-        get() = previewerFrame?.isVisible == true
+        get() = Prefs.showSplitView && previewerFrame?.isVisible == true
 
     private lateinit var binding: ActivityNoteEditorBinding
 
@@ -94,6 +94,12 @@ class NoteEditorActivity :
         setContentView(binding.root)
 
         previewerFrame = binding.previewerFrame
+        // Hide the preview pane and divider when split view is disabled so the layout collapses
+        // to single-pane and the toolbar preview icon becomes available again.
+        if (previewerFrame != null && !Prefs.showSplitView) {
+            binding.previewerFrameLayout?.isVisible = false
+            binding.noteEditorResizingDivider?.isVisible = false
+        }
         Timber.i("Note Editor is in %s mode", if (fragmented) "split" else "single-pane")
 
         // TODO: specify how non-null but invalid extras are handled
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/analytics/AnalyticsConstants.kt b/AnkiDroid/src/main/java/com/ichi2/anki/analytics/AnalyticsConstants.kt
index 85bf38d8f7ee..dc378383c6d0 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/analytics/AnalyticsConstants.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/analytics/AnalyticsConstants.kt
@@ -175,6 +175,7 @@ object AnalyticsConstants {
             R.string.show_audio_play_buttons_key, // Show play buttons on cards with audio (reversed in collection: HIDE_AUDIO_PLAY_BUTTONS)
             R.string.pref_display_filenames_in_browser_key, // Display filenames in card browser
             R.string.show_deck_title_key, // Show deck title
+            R.string.show_split_view_key, // Show split view
             // ******************************** Controls *********************************************
             R.string.gestures_preference, // Enable gestures
             R.string.gestures_corner_touch_preference, // 9-point touch
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/settings/Prefs.kt b/AnkiDroid/src/main/java/com/ichi2/anki/settings/Prefs.kt
index b50346a51671..a124a8b67479 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/settings/Prefs.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/settings/Prefs.kt
@@ -240,6 +240,13 @@ open class PrefsRepository(
 
     val exitViaDoubleTapBack by booleanPref(R.string.exit_via_double_tap_back_key, false)
 
+    /**
+     * Whether to show side-by-side split panes on large screens.
+     * Applies to the note editor, card browser, and template editor.
+     * When false, all screens use a single-pane layout.
+     */
+    var showSplitView by booleanPref(R.string.show_split_view_key, defaultValue = true)
+
     // ****************************************** Sync ****************************************** //
 
     val isAutoSyncEnabled by booleanPref(R.string.automatic_sync_choice_key, false)
diff --git a/AnkiDroid/src/main/res/layout-sw600dp/activity_card_browser.xml b/AnkiDroid/src/main/res/layout-w840dp/activity_card_browser.xml
similarity index 100%
rename from AnkiDroid/src/main/res/layout-sw600dp/activity_card_browser.xml
rename to AnkiDroid/src/main/res/layout-w840dp/activity_card_browser.xml
diff --git a/AnkiDroid/src/main/res/layout-sw600dp/activity_card_template_editor.xml b/AnkiDroid/src/main/res/layout-w840dp/activity_card_template_editor.xml
similarity index 100%
rename from AnkiDroid/src/main/res/layout-sw600dp/activity_card_template_editor.xml
rename to AnkiDroid/src/main/res/layout-w840dp/activity_card_template_editor.xml
diff --git a/AnkiDroid/src/main/res/layout-sw600dp/activity_homescreen.xml b/AnkiDroid/src/main/res/layout-w840dp/activity_homescreen.xml
similarity index 100%
rename from AnkiDroid/src/main/res/layout-sw600dp/activity_homescreen.xml
rename to AnkiDroid/src/main/res/layout-w840dp/activity_homescreen.xml
diff --git a/AnkiDroid/src/main/res/layout-sw600dp/activity_note_editor.xml b/AnkiDroid/src/main/res/layout-w840dp/activity_note_editor.xml
similarity index 100%
rename from AnkiDroid/src/main/res/layout-sw600dp/activity_note_editor.xml
rename to AnkiDroid/src/main/res/layout-w840dp/activity_note_editor.xml
diff --git a/AnkiDroid/src/main/res/values/10-preferences.xml b/AnkiDroid/src/main/res/values/10-preferences.xml
index 1c2aaaef6656..73896908ffc1 100644
--- a/AnkiDroid/src/main/res/values/10-preferences.xml
+++ b/AnkiDroid/src/main/res/values/10-preferences.xml
@@ -34,6 +34,7 @@
     <string name="pref_cat_workarounds" maxLength="41">Workarounds</string>
     <string name="pref_cat_plugins" maxLength="41">Plugins</string>
     <string name="pref_cat_editing" maxLength="41">Editing</string>
+    <string name="pref_cat_layout" maxLength="41">Layout</string>
 
     <!-- preferences.xml entries-->
     <string name="whiteboard_stroke_width" maxLength="41">Stroke width</string>
@@ -179,6 +180,8 @@
     <string name="accessibility" maxLength="41">Accessibility</string>
     <!-- Paste clipboard image as png option -->
     <string name="paste_as_png" maxLength="41">Paste clipboard images as PNG</string>
+    <string name="show_split_view" maxLength="41">Split view</string>
+    <string name="show_split_view_summ">Show side-by-side panes on large screens in the note editor, card browser, template editor, and deck picker</string>
     <string name="exit_via_double_tap_back" maxLength="41">Press back twice to go back/exit</string>
     <string name="exit_via_double_tap_back_summ">To avoid accidentally leaving the study screen or the app</string>
     <!-- Allow all files in media imports -->
diff --git a/AnkiDroid/src/main/res/values/preferences.xml b/AnkiDroid/src/main/res/values/preferences.xml
index 4d3f371d4c80..fc205dc98a9a 100644
--- a/AnkiDroid/src/main/res/values/preferences.xml
+++ b/AnkiDroid/src/main/res/values/preferences.xml
@@ -33,6 +33,7 @@
     <string name="pref_backup_limits_screen_key">backupLimitsScreen</string>
     <!-- Editing -->
     <string name="paste_png_key">pastePNG</string>
+    <string name="show_split_view_key">showSplitView</string>
     <!-- Switch Profile -->
     <string name="pref_switch_profile_screen_key">switchProfileScreen</string>
     <string name="pref_enable_switch_profile_key">enableSwitchProfile</string>
diff --git a/AnkiDroid/src/main/res/xml/preferences_appearance.xml b/AnkiDroid/src/main/res/xml/preferences_appearance.xml
index 78647bc228ea..ce91fe9da0c9 100644
--- a/AnkiDroid/src/main/res/xml/preferences_appearance.xml
+++ b/AnkiDroid/src/main/res/xml/preferences_appearance.xml
@@ -128,6 +128,13 @@
             android:defaultValue="false"
             android:title="@string/show_deck_title"/>
     </PreferenceCategory>
+    <PreferenceCategory android:title="@string/pref_cat_layout">
+        <SwitchPreferenceCompat
+            android:defaultValue="true"
+            android:key="@string/show_split_view_key"
+            android:summary="@string/show_split_view_summ"
+            android:title="@string/show_split_view" />
+    </PreferenceCategory>
     <PreferenceCategory android:title="@string/card_browser">
         <SwitchPreferenceCompat
             android:checked="false"
diff --git a/AnkiDroid/src/test/java/com/ichi2/anki/DeckPickerTest.kt b/AnkiDroid/src/test/java/com/ichi2/anki/DeckPickerTest.kt
index cf125c1a0136..7a53d70459d2 100644
--- a/AnkiDroid/src/test/java/com/ichi2/anki/DeckPickerTest.kt
+++ b/AnkiDroid/src/test/java/com/ichi2/anki/DeckPickerTest.kt
@@ -94,7 +94,7 @@ class DeckPickerTest : RobolectricTest() {
     companion object {
         @ParameterizedRobolectricTestRunner.Parameters
         @JvmStatic // required for initParameters
-        fun initParameters(): Collection<String> = listOf("normal", "xlarge")
+        fun initParameters(): Collection<String> = listOf("normal", "w1280dp")
     }
 
     @Before
@@ -537,7 +537,7 @@ class DeckPickerTest : RobolectricTest() {
 
     @Test
     fun checkDisplayOfStudyOptionsOnTablet() {
-        assumeTrue("We are running on a tablet", qualifiers!!.contains("xlarge"))
+        assumeTrue("We are running on a tablet", qualifiers!!.contains("w1280dp"))
         val deckPickerEx =
             super.startActivityNormallyOpenCollectionWithIntent(
                 DeckPickerEx::class.java,
diff --git a/AnkiDroid/src/test/java/com/ichi2/testutils/ScreenSize.kt b/AnkiDroid/src/test/java/com/ichi2/testutils/ScreenSize.kt
index fdc1f3879197..f77669ba5f61 100644
--- a/AnkiDroid/src/test/java/com/ichi2/testutils/ScreenSize.kt
+++ b/AnkiDroid/src/test/java/com/ichi2/testutils/ScreenSize.kt
@@ -20,7 +20,7 @@ import org.robolectric.RuntimeEnvironment
 import timber.log.Timber
 
 /** [block] runs with a runtime qualifier emulating a split-pane display */
-fun withSplitPaneUi(block: () -> Unit) = withQualifier("sw700dp", block)
+fun withSplitPaneUi(block: () -> Unit) = withQualifier("w840dp", block)
 
 fun withQualifier(
     newQualifier: String,
@@ -38,7 +38,7 @@ fun withQualifier(
 }
 
 /** [block] runs with a runtime qualifier emulating a split-pane display */
-suspend fun withSplitPaneUiAsync(block: suspend () -> Unit) = withQualifierAsync("sw700dp", block)
+suspend fun withSplitPaneUiAsync(block: suspend () -> Unit) = withQualifierAsync("w840dp", block)
 
 suspend fun withQualifierAsync(
     newQualifier: String,