About

The Menu UI module provides an interface for managing menus. A menu is a hierarchical collection of links, which can be within or external to the site, generally used for navigation. For more information, see the online documentation for the Menu UI module.

Uses

Managing menus
Users with the Administer menus and menu links permission can add, edit, and delete custom menus on the Menus page. Custom menus can be special site menus, menus of external links, or any combination of internal and external links. You may create an unlimited number of additional menus, each of which will automatically have an associated block (if you have the Block module installed). By selecting Edit menu, you can add, edit, or delete links for a given menu. The links listing page provides a drag-and-drop interface for controlling the order of links, and creating a hierarchy within the menu.
Displaying menus
If you have the Block module installed, then each menu that you create is rendered in a block that you enable and position on the Block layout page. In some themes, the main menu and possibly the secondary menu will be output automatically; you may be able to disable this behavior on the theme's settings page.

Menu UI administration pages