diff --git a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs-topbar.inc.css b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs-topbar.inc.css
index 03357527a..95df75975 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs-topbar.inc.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs-topbar.inc.css
@@ -13,7 +13,9 @@ height: var(--zen-toolbar-height);
     }
   }
 
-  &:not([zen-has-hover='true']):not([has-popup-menu]):not(:focus-within) {
+  &:not([zen-has-hover='true']):not([has-popup-menu]):not(:focus-within):not(:has(
+    *:is([panelopen='true'], [open='true'])
+  )) {
     transition-delay: 0.2s;
     height: var(--zen-element-separation);
     overflow: hidden;
diff --git a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
index e3cf7d309..fd372c882 100644
--- a/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
+++ b/src/browser/base/content/zen-styles/zen-tabs/vertical-tabs.css
@@ -359,6 +359,7 @@
   flex-direction: column;
   min-height: fit-content !important;
   overflow: visible;
+  max-height: unset !important;
 
   & .tabbrowser-tab:not(:hover) .tab-background:not([selected]):not([multiselected]) {
     background: transparent !important;