You can navigate this menu using keystroke shortcuts.
For each item having an underlined letter or number, press Alt + the underlined character to perform the item's action or expand its submenu.
For each active submenu item having an underlined letter or number, press either Alt + the underlined character or simply the underlined character to perform the item's action or expand its submenu.
If there is an active item, you can navigate the menu by pressing the arrows, or the ESC or ENTER keys, or the SPACE bar.
You can traverse the menu items in order by pressing the TAB key.