diff --git a/src/browser/base/content/ZenUIManager.mjs b/src/browser/base/content/ZenUIManager.mjs
index d6e46354f..33e83149b 100644
--- a/src/browser/base/content/ZenUIManager.mjs
+++ b/src/browser/base/content/ZenUIManager.mjs
@@ -107,6 +107,7 @@ var gZenVerticalTabsManager = {
 
 var gZenCompactModeManager = {
   init() {
+    Services.prefs.addObserver('zen.view.compact', this._updateEvent.bind(this));
   },
 
   get prefefence() {
@@ -117,6 +118,10 @@ var gZenCompactModeManager = {
     Services.prefs.setBoolPref('zen.view.compact', value);
   },
 
+  _updateEvent() {
+    Services.prefs.setBoolPref('zen.view.sidebar-expanded.on-hover', false);
+  },
+
   toggle() {
     this.preference = !this.prefefence;
   },