Figure 2-4:

Sample open menu
After you’ve opened a menu, you can point to any item on the menu to highlight it, or to display any
submenus that might be available. If a menu option has a submenu to offer, you’ll see a right-pointing
triangle at the right edge of the option. Pointing to the option will instantly display the submenu. If ever
you open a menu by accident, or change your mind after the fact, you can back out gracefully by
pressing the trusty Esc key, or by clicking some neutral area outside the menu.
To select an option on the menu, click it. After you’ve opened a menu, you also can move the cursor
across the menu bar (without holding down any mouse buttons) to open those menus.