frontend/src/components/layout/SidebarComponent.tsx

@@ -86,11 +86,13 @@ const SidebarComponent: FC<Props> = ({
   const getClampedWidth = useCallback ((
       nextWidth: number,
       containerWidth: number): number => {
-    const dynamicMaxWidth = getSidebarMaxWidth (containerWidth)
+    const viewportWidth =
+	typeof window === 'undefined' ? containerWidth : window.innerWidth
+    const viewportMaxWidth = Math.floor (viewportWidth * MAX_VIEWPORT_WIDTH_RATIO)
     const maxAllowedWidth =
 	maxWidth == null
-	? dynamicMaxWidth
+	? getSidebarMaxWidth (containerWidth)
-	: Math.max (MIN_SIDEBAR_WIDTH, Math.min (dynamicMaxWidth, maxWidth))
+	: Math.max (MIN_SIDEBAR_WIDTH, Math.min (viewportMaxWidth, maxWidth))
 
     return Math.min (maxAllowedWidth, Math.max (MIN_SIDEBAR_WIDTH, nextWidth))
   }, [maxWidth])