diff --git a/backend/custom_admin/src/components/schedule-builder/item.tsx b/backend/custom_admin/src/components/schedule-builder/item.tsx
index 274b30bfa0..85458a2c9a 100644
--- a/backend/custom_admin/src/components/schedule-builder/item.tsx
+++ b/backend/custom_admin/src/components/schedule-builder/item.tsx
@@ -220,7 +220,11 @@ export const ScheduleItemCard = ({
   };
 
   return (
-    <Card ref={dragRef} size="1" style={{ opacity, cursor: "grab" }}>
+    <Card
+      ref={dragRef}
+      size="1"
+      style={{ opacity, cursor: "grab", height: "100%" }}
+    >
       <Flex direction="column" gap="1" align="start">
         {availability === "unavailable" && (
           <Flex align="center" gap="1">
diff --git a/backend/custom_admin/src/components/shared/django-admin-editor-modal/index.tsx b/backend/custom_admin/src/components/shared/django-admin-editor-modal/index.tsx
index a74723a3af..11f2c6666d 100644
--- a/backend/custom_admin/src/components/shared/django-admin-editor-modal/index.tsx
+++ b/backend/custom_admin/src/components/shared/django-admin-editor-modal/index.tsx
@@ -40,13 +40,8 @@ export const DjangoAdminEditorModal = () => {
     });
   };
 
-  if (!url) {
-    return null;
-  }
-
   const baseUrl =
     document.location.ancestorOrigins?.[0] || document.location.origin;
-  const itemUrl = `${baseUrl}/admin${url}`;
 
   return (
     <Dialog.Root open={isOpen} onOpenChange={(open) => !open && onClose()}>
@@ -54,7 +49,16 @@ export const DjangoAdminEditorModal = () => {
         <VisuallyHidden>
           <Dialog.Title>Admin view</Dialog.Title>
         </VisuallyHidden>
-        <iframe title="Admin view" src={itemUrl} className="w-full h-[85vh]" />
+        {/* url is null while the dialog animates closed; keep Dialog.Root
+            mounted so Radix can finish closing and restore body pointer
+            events — unmounting it while open leaves the page unclickable. */}
+        {url && (
+          <iframe
+            title="Admin view"
+            src={`${baseUrl}/admin${url}`}
+            className="w-full h-[85vh]"
+          />
+        )}
       </Dialog.Content>
     </Dialog.Root>
   );
diff --git a/backend/custom_admin/src/custom-styles.css b/backend/custom_admin/src/custom-styles.css
index da6cf32626..c9f1cdc4d5 100644
--- a/backend/custom_admin/src/custom-styles.css
+++ b/backend/custom_admin/src/custom-styles.css
@@ -12,7 +12,20 @@
     opacity: 0;
     animation: rt-fade-out 200ms cubic-bezier(0.16, 1, 0.3, 1);
   }
-  z-index: 30;
+  /* Must beat the schedule grid's z-[100] sticky headers: .radix-themes
+     creates no stacking context, so the grid competes with portals at the
+     body level. 500 matches the old shared Modal overlay. */
+  z-index: 500;
+}
+
+/* Portalled popper content (Select, DropdownMenu, Popover, Tooltip) has no
+   z-index in Radix Themes and relies on DOM order, so it paints below the
+   dialog overlay once that has an explicit z-index. The popper wrapper copies
+   the content's computed z-index, so a class rule here is enough. */
+.rt-PopperContent,
+.rt-SelectContent,
+.rt-TooltipContent {
+  z-index: 510;
 }
 
 .rt-BaseDialogContent {