Marking menus appear when you hold a hotkey and press . You can set a hotkey to show one of the pre-made marking menus that come with Maya, or a custom marking menu you have created.
To assign a marking menu to a hotkey
For example, type m in the text box and turn on the Alt setting to assign the marking menu to + m.
As you edit these settings, Maya shows the command currently assigned to the hotkey, if any. Only assign the hotkey if you don’t mind overriding this command.
If the hotkey you set already has a command assigned, Maya asks if you want to override it.