diff --git a/src/browser/base/zen-components/ZenCompactMode.mjs b/src/browser/base/zen-components/ZenCompactMode.mjs
index bc45a944c..c6a42a40f 100644
--- a/src/browser/base/zen-components/ZenCompactMode.mjs
+++ b/src/browser/base/zen-components/ZenCompactMode.mjs
@@ -249,6 +249,10 @@ var gZenCompactModeManager = {
 
                 setTimeout(() => {
                   this.sidebar.style.removeProperty('transition');
+
+                  // Just in case:
+                  this.sidebar.style.removeProperty('margin-right');
+                  this.sidebar.style.removeProperty('margin-left');
                 }, 200);
 
                 resolve();