Increase default sidebar size (#16375)

GitOrigin-RevId: 0df345a468f68d2205bf919efa8d93be40d7a048

services/web/frontend/js/features/ide-react/components/layout/main-layout.tsx

@@ -64,7 +64,7 @@ export const MainLayout: FC = () => {
             ref={sidebarPanelRef}
             id="panel-sidebar"
             order={1}
-            defaultSize={10}
+            defaultSize={15}
             minSize={5}
             maxSize={30}
             collapsible