diff --git a/rsconcept/frontend/src/components/dropdown/use-dropdown.ts b/rsconcept/frontend/src/components/dropdown/use-dropdown.ts
index 4a2d8d81..52854df8 100644
--- a/rsconcept/frontend/src/components/dropdown/use-dropdown.ts
+++ b/rsconcept/frontend/src/components/dropdown/use-dropdown.ts
@@ -7,7 +7,16 @@ export function useDropdown() {
   const ref = useRef<HTMLDivElement>(null);
 
   function handleBlur(event: React.FocusEvent<HTMLDivElement>) {
-    if (ref.current?.contains(event.relatedTarget as Node)) {
+    const nextTarget = event.relatedTarget as Node | null;
+    if (nextTarget && ref.current?.contains(nextTarget)) {
+      return;
+    }
+
+    // Keep open when focus moves into a popover (e.g., ComboBox menu rendered via portal)
+    if (
+      nextTarget instanceof Element &&
+      (nextTarget.closest("[data-slot='popover-content']") || nextTarget.closest("[data-slot='popover-trigger']"))
+    ) {
       return;
     }
     setIsOpen(false);