There are seven menus always available in Maya: File, Edit, Create, Select, Modify, Display and Windows.
All other menus change depending on the menu set you select: Modeling, Rigging, Animation, Dynamics, Rendering. Each menu set is designed to support a particular workflow.
You select the menu set you want to work with from the drop-down list in the Status bar.
To switch between menu sets, use the drop-down menu in the Status Line, or use hotkeys. The default hotkeys are:
You can create custom menu sets that contain your choice of menu items - see Custom menu sets.
You can display menus as separate windows. This is helpful when you use a menu repeatedly. Pull down the menu and click the tear-off line at the top. Tear-off menus always display on top.