diff --git a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
index c5863c1..cc97f4b 100644
--- a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
+++ b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
@@ -310,6 +310,10 @@
             assertTrue("The second app we should have quick switched to is not running",
                     isTestActivityRunning(2));
         }
+        background = getAndAssertBackground();
+        background.quickSwitchToPreviousAppSwipeLeft();
+        assertTrue("The 2nd app we should have quick switched to is not running",
+                isTestActivityRunning(3));
         getAndAssertBackground();
     }
 
diff --git a/src/com/android/launcher3/InvariantDeviceProfile.java b/src/com/android/launcher3/InvariantDeviceProfile.java
index ff53b5f..1d88e83 100644
--- a/src/com/android/launcher3/InvariantDeviceProfile.java
+++ b/src/com/android/launcher3/InvariantDeviceProfile.java
@@ -19,6 +19,7 @@
 import static com.android.launcher3.Utilities.getDevicePrefs;
 import static com.android.launcher3.Utilities.getPointString;
 import static com.android.launcher3.config.FeatureFlags.APPLY_CONFIG_AT_RUNTIME;
+import static com.android.launcher3.config.FeatureFlags.ENABLE_FOUR_COLUMNS;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.launcher3.util.PackageManagerHelper.getPackageFilter;
 
@@ -215,6 +216,9 @@
     }
 
     public static String getCurrentGridName(Context context) {
+        if (ENABLE_FOUR_COLUMNS.get()) {
+            return ENABLE_FOUR_COLUMNS.key;
+        }
         return Utilities.isGridOptionsEnabled(context)
                 ? Utilities.getPrefs(context).getString(KEY_IDP_GRID_NAME, null) : null;
     }
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index 8f63c09..883eab0 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -190,6 +190,10 @@
             "EXPANDED_SMARTSPACE", false, "Expands smartspace height to two rows. "
               + "Any apps occupying the first row will be removed from workspace.");
 
+    public static final BooleanFlag ENABLE_FOUR_COLUMNS = new DeviceFlag(
+            "ENABLE_FOUR_COLUMNS", false, "Uses 4 columns in launcher grid."
+            + "Warning: This will permanently alter your home screen items and is not reversible.");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {
diff --git a/tests/tapl/com/android/launcher3/tapl/Background.java b/tests/tapl/com/android/launcher3/tapl/Background.java
index 153b3ce..d317783 100644
--- a/tests/tapl/com/android/launcher3/tapl/Background.java
+++ b/tests/tapl/com/android/launcher3/tapl/Background.java
@@ -144,14 +144,25 @@
     private void expectSwitchToOverviewEvents() {
     }
 
-    /**
-     * Swipes right or double presses the square button to switch to the previous app.
-     */
     @NonNull
     public Background quickSwitchToPreviousApp() {
+        boolean toRight = true;
+        quickSwitch(toRight);
+        return new Background(mLauncher);
+    }
+
+    @NonNull
+    public Background quickSwitchToPreviousAppSwipeLeft() {
+        boolean toRight = false;
+        quickSwitch(toRight);
+        return new Background(mLauncher);
+    }
+
+    @NonNull
+    private void quickSwitch(boolean toRight) {
         try (LauncherInstrumentation.Closable e = mLauncher.eventsCheck();
-             LauncherInstrumentation.Closable c = mLauncher.addContextLayer(
-                     "want to quick switch to the previous app")) {
+            LauncherInstrumentation.Closable c = mLauncher.addContextLayer(
+                    "want to quick switch to the previous app")) {
             verifyActiveContainer();
             final boolean launcherWasVisible = mLauncher.isLauncherVisible();
             boolean transposeInLandscape = false;
@@ -164,19 +175,36 @@
                     final int startY;
                     final int endX;
                     final int endY;
-                    if (mLauncher.getDevice().isNaturalOrientation() || !transposeInLandscape) {
-                        // Swipe from the bottom left to the bottom right of the screen.
-                        startX = 0;
-                        startY = getSwipeStartY();
-                        endX = mLauncher.getDevice().getDisplayWidth();
-                        endY = startY;
+                    if (toRight) {
+                        if (mLauncher.getDevice().isNaturalOrientation() || !transposeInLandscape) {
+                            // Swipe from the bottom left to the bottom right of the screen.
+                            startX = 0;
+                            startY = getSwipeStartY();
+                            endX = mLauncher.getDevice().getDisplayWidth();
+                            endY = startY;
+                        } else {
+                            // Swipe from the bottom right to the top right of the screen.
+                            startX = getSwipeStartX();
+                            startY = mLauncher.getRealDisplaySize().y - 1;
+                            endX = startX;
+                            endY = 0;
+                        }
                     } else {
-                        // Swipe from the bottom right to the top right of the screen.
-                        startX = getSwipeStartX();
-                        startY = mLauncher.getRealDisplaySize().y - 1;
-                        endX = startX;
-                        endY = 0;
+                        if (mLauncher.getDevice().isNaturalOrientation() || !transposeInLandscape) {
+                            // Swipe from the bottom right to the bottom left of the screen.
+                            startX = mLauncher.getDevice().getDisplayWidth();
+                            startY = getSwipeStartY();
+                            endX = 0;
+                            endY = startY;
+                        } else {
+                            // Swipe from the bottom left to the top left of the screen.
+                            startX = getSwipeStartX();
+                            startY = 0;
+                            endX = startX;
+                            endY = mLauncher.getRealDisplaySize().y - 1;
+                        }
                     }
+
                     final boolean isZeroButton = mLauncher.getNavigationModel()
                             == LauncherInstrumentation.NavigationModel.ZERO_BUTTON;
                     LauncherInstrumentation.GestureScope gestureScope =
@@ -205,7 +233,7 @@
                     break;
             }
             mLauncher.expectEvent(TestProtocol.SEQUENCE_MAIN, TASK_START_EVENT);
-            return new Background(mLauncher);
+            return;
         }
     }