diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationsQSContainerController.kt b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationsQSContainerController.kt
index e4161a37e52e8..7764d33856ca8 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationsQSContainerController.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationsQSContainerController.kt
@@ -234,7 +234,7 @@ class NotificationsQSContainerController @Inject constructor(
         val endConstraintId = if (splitShadeEnabled) R.id.qs_edge_guideline else PARENT_ID
         constraintSet.apply {
             connect(R.id.qs_frame, END, endConstraintId, END)
-            setMargin(R.id.qs_frame, START, panelMarginHorizontal)
+            setMargin(R.id.qs_frame, START, if (splitShadeEnabled) 0 else panelMarginHorizontal)
             setMargin(R.id.qs_frame, END, if (splitShadeEnabled) 0 else panelMarginHorizontal)
             setMargin(R.id.qs_frame, TOP, topMargin)
         }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/NotificationQSContainerControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/NotificationQSContainerControllerTest.kt
index 9e64f017d88ea..83eabb6679979 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/NotificationQSContainerControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/NotificationQSContainerControllerTest.kt
@@ -456,6 +456,26 @@ class NotificationQSContainerControllerTest : SysuiTestCase() {
                 .isEqualTo(0)
     }
 
+    @Test
+    fun testSplitShadeLayout_qsFrameHasHorizontalMarginsOfZero() {
+        enableSplitShade()
+        controller.updateResources()
+        assertThat(getConstraintSetLayout(R.id.qs_frame).endMargin).isEqualTo(0)
+        assertThat(getConstraintSetLayout(R.id.qs_frame).startMargin).isEqualTo(0)
+    }
+
+    @Test
+    fun testSinglePaneShadeLayout_qsFrameHasHorizontalMarginsSetToCorrectValue() {
+        disableSplitShade()
+        controller.updateResources()
+        val notificationPanelMarginHorizontal = context.resources
+                .getDimensionPixelSize(R.dimen.notification_panel_margin_horizontal)
+        assertThat(getConstraintSetLayout(R.id.qs_frame).endMargin)
+                .isEqualTo(notificationPanelMarginHorizontal)
+        assertThat(getConstraintSetLayout(R.id.qs_frame).startMargin)
+                .isEqualTo(notificationPanelMarginHorizontal)
+    }
+
     @Test
     fun testSinglePaneShadeLayout_isAlignedToParent() {
         disableSplitShade()