diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59de18d..8726e48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -87,6 +87,10 @@ The format is inspired by Keep a Changelog and SemVer.
   when not current). Centralized in a new `format_time.js` helper used
   by both the Load dialog rows and the status tooltip so future surfaces
   stay aligned.
+- **Sidebar context menus now enforce a single open menu.** Opening a
+  workflow, directory, archive, or Workflows-header right-click menu now closes
+  any previous sidebar context menu first, so repeated right-clicks cannot
+  stack multiple floating menus with stale actions.
 - **"Create directory" moved off the Workflows toolbar onto right-click of
   the section header.** The 📂 (`pi-folder-open`) button used to live in the
   Workflows action bar between the section label and the Save buttons. Tree-
diff --git a/web/sidebar/modals.js b/web/sidebar/modals.js
index e4d6ed4..9ac1872 100644
--- a/web/sidebar/modals.js
+++ b/web/sidebar/modals.js
@@ -2149,12 +2149,34 @@ export function showSnapshotSettingsDialog({
 // =============================================================================
 // Context menu helper
 // =============================================================================
+let activeContextMenuCleanup = null;
+
+function closeActiveContextMenu() {
+    if (activeContextMenuCleanup) {
+        activeContextMenuCleanup();
+        activeContextMenuCleanup = null;
+    }
+}
+
 export function showContextMenu(event, items) {
     event.preventDefault();
     event.stopPropagation();
+    closeActiveContextMenu();
 
     const menu = document.createElement("div");
     menu.className = "koolook-context-menu";
+    let closeOnClick = null;
+
+    const cleanup = () => {
+        menu.remove();
+        if (closeOnClick) {
+            document.removeEventListener("click", closeOnClick);
+            document.removeEventListener("contextmenu", closeOnClick);
+            closeOnClick = null;
+        }
+        if (activeContextMenuCleanup === cleanup) activeContextMenuCleanup = null;
+    };
+    activeContextMenuCleanup = cleanup;
 
     for (const item of items) {
         if (!item) {
@@ -2172,7 +2194,7 @@ export function showContextMenu(event, items) {
             m.style.cursor = "not-allowed";
         } else {
             m.addEventListener("click", () => {
-                menu.remove();
+                cleanup();
                 item.action();
             });
         }
@@ -2188,11 +2210,9 @@ export function showContextMenu(event, items) {
     if (rect.bottom > window.innerHeight) menu.style.top = `${event.clientY - rect.height}px`;
 
     setTimeout(() => {
-        const closeOnClick = (ev) => {
+        closeOnClick = (ev) => {
             if (!menu.contains(ev.target)) {
-                menu.remove();
-                document.removeEventListener("click", closeOnClick);
-                document.removeEventListener("contextmenu", closeOnClick);
+                cleanup();
             }
         };
         document.addEventListener("click", closeOnClick);