Menu lets you change the appearance and behavior of menus throughout the BeOS. Most importantly, it lets you set the system-wide shortcut key -- this is the key that you use in combination with a character to perform a menu command.
Font lets you choose a font and style.
Font Size lets you choose a font size.
If Click to Open, is checked, you can open a menu or submenu by clicking the menu's title; if unchecked you can only drag through menus.
If Always Show Triggers is checked, triggers for menu titles, commands, and other menu items are always visible and can be activated by pressing the trigger letter.
Color Scheme set the colors that are used in menus.
Separator Style lets you choose the type of separator that's used to group commands in a menu.
Key as Shortcut Key lets you choose Alt or Control as your shortcut key. (On Macintosh, the Alt key is the Apple "cloverleaf.")
Menu changes are enforced when you launch an application. For example, if you change the menu font size, the applications that are currently running aren't affected, but all subsequently launched applications will display the change.