Wield Menu

This plugin makes long and complex navigation menus better manageable by creating groups that can be expanded and collapsed.

By default, all navigation menus in wp-admin will be collapsed. When holding the Option/Alt-key while clicking, all sublevels will be expanded with one click.

For general support, please use the support forums on wordpress.org
For developers: Head over to the Github repository
For everything else, find me on twitter or slack