diff --git a/dicom-viewer/src/App.tsx b/dicom-viewer/src/App.tsx
index 4fba525..94b70f8 100644
--- a/dicom-viewer/src/App.tsx
+++ b/dicom-viewer/src/App.tsx
@@ -3492,13 +3492,13 @@ function App({ container_id, imageStacks, autoCacheStack, annotationJson, viewer
       </div>
 
 
-      {/* Settings button at top right */}
+      {/* Settings button at top-left (shift when side menu open) to avoid overlapping right-side controls */}
       <button
         style={{
           position: "absolute",
           top: 8,
-          right: 8,
-          zIndex: 20,
+          left: sideMenuOpen ? 250 + 16 : 16,
+          zIndex: 2600,
           padding: "6px 12px",
           background: "#222",
           color: "#fff",