Aaron D. Campbell

WordPress 3.3 introduced new flyout admin menus. If you prefer to be able to 
choose to have some menu items expanded this plugin will let you. Closed menu 
items still flyout. Open items are saved in a cookie, so while they persist, 
they don’t persist from browser to browser. JavaScript is required.

Expanded Admin Menus

Allows you to expand admin menus similar to WordPress 3.2

David Sader

Enable or disable WordPress <a href="https://codex.wordpress.org/Create_A_Network" rel="nofollow ugc">Multisite</a> backend menus. Adds options to toggle administration menus at Network Admin->Settings page under “Menu Settings”. WP already toggles the Plugins menu, I’ve added a bunch more in the same/similar way.
I use the plugin to simplify the menus available to the entire network of sites. I use this plugin in a Multisite installation to disable the Delete Blog, Permalinks, Import, Add Users and Theme customizer menus.
The plugin also removes some of the admin bar menu items as well.

Menus

A Multisite Network plugin to toggle administration menus for the entire network of sites.

Expanded Admin Menus vs Menus