diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/features/partialcustomtab/PartialCustomTabSideSheetStrategy.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/features/partialcustomtab/PartialCustomTabSideSheetStrategy.java
index 04fee5d52e851a..f5cbcaa64db9c2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/features/partialcustomtab/PartialCustomTabSideSheetStrategy.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/features/partialcustomtab/PartialCustomTabSideSheetStrategy.java
@@ -181,7 +181,12 @@ boolean toggleMaximize(boolean animate) {
         } else {
             start = windowLayout.width;
             end = mIsMaximized ? displayWidth : clampedInitialWidth;
-            updateListener = (anim) -> setWindowWidth((int) anim.getAnimatedValue());
+            View content = (ViewGroup) mActivity.findViewById(R.id.compositor_view_holder);
+            updateListener = (anim) -> {
+                // Switch the invisibility type to GONE to prevent sluggish resizing artifacts.
+                if (content.getVisibility() != View.GONE) content.setVisibility(View.GONE);
+                setWindowWidth((int) anim.getAnimatedValue());
+            };
         }
         // Keep the WebContents invisible during the animation to hide the jerky visual artifacts
         // of the contents due to resizing.
@@ -203,6 +208,7 @@ private void setContentVisible(boolean visible) {
     }
 
     private void onMaximizeEnd() {
+        setContentVisible(false);
         if (isMaximized()) {
             if (mSheetOnRight) {
                 configureLayoutBeyondScreen(false);