WP Better Sub Menus improves the menu admin screen (nav-menus.php) by allowing you to Expand/Contract the menu items. Specially useful when your menu consist of a few dozens of items.
Other features include:
- Sticky sidebar for easier access to the links sidebar menu
- Scrollable sidebar.
- Colored menu items to indicate if a menu item has subitems inside
- Easy click & expand or click & contract.