style: improve Dashboard default layout

Author: atyrode

src/frontend/src/ui/MainMenu.tsx

@@ -53,8 +53,8 @@ export const MainMenuConfig: React.FC<MainMenuConfigProps> = ({
 
     const dashboardElement = ExcalidrawElementFactory.createEmbeddableElement({
       link: "!dashboard",
-      width: 460,
-      height: 80
+      width: 360,
+      height: 360
     });
 
     ExcalidrawElementFactory.placeInScene(dashboardElement, excalidrawAPI, {