About the sysmenu.xml file
The sysmenu.xml file defines the names and contents of menus.
By default, the menu items get their names from the corresponding module's definition in the sysmodules.xml file, but you can override the display name by using the <display> element.
Every item in the sysmenu.xml file must have a corresponding module in the sysmodules.xml file.
If you want to reorganize menu items in their menus, rename a menu you created, or add a menu item, you must edit the sysmenu.xml file.
Sysmenu.xml elements