FTS Advanced, page 5-39:
Custom Menus in FileMaker Go
Custom menus behave slightly differently in FileMaker Go. Menu items removed from a custom menu will be disabled rather than removed in FileMaker Go. FileMaker Go also has some menu items that custom menus cannot override, such as Quick Find and Exit Record.
Note: When renaming menu items, the ampersand character will not be displayed in FileMaker Go menu items. Also, be aware that some custom menus/menu commands not available in FileMaker Go will be ignored if installed by a custom menu set in FileMaker Go.