Please consider adding “collapse” and order control buttons

Please consider improving the functionality of dragging and dropping and reordering items. I’m talking about my experience of customizing the admin menu. Now, if there are many sub-items in an item, then dragging and dropping is very inconvenient, especially if the item is somewhere from the bottom and I want to place it higher.

Also, if I install a new plugin and click on the add new items button, only new items of higher order are added. If the plugin only adds a sub-item to an existing menu, it does not appear. Also, items that are no longer relevant after uninstalling the plugin do not disappear and it is not clear how to remove them.