diff --git a/src/browser/base/content/zen-styles/zen-panel-ui.css b/src/browser/base/content/zen-styles/zen-panel-ui.css
index 240b4886..bcefa1ea 100644
--- a/src/browser/base/content/zen-styles/zen-panel-ui.css
+++ b/src/browser/base/content/zen-styles/zen-panel-ui.css
@@ -43,6 +43,8 @@ panel[type='arrow'] {
     --panel-border-color: transparent !important;
     --panel-shadow-margin: 0px !important;
 
+    transition-duration: 0s !important;
+
     &::part(content) {
       animation: none !important;
     }