Office 2013, 2010 and 2007 provides users with the option to minimize the Office Ribbon. For example, a new email message window in Outlook will display the following Ribbon. And by minimizing, more space can be available for the application.
Show or hide Office Ribbon in Office 2010 and 2007
To enable the auto hide Office Ribbon feature you can do either of the following
Right Click on the File menu and select Minimize the Ribbon from the menu list.
Press Ctrl + F1, it is a toggle switch enable or disable Minimize the Ribbon option.
Enable or disable Office Ribbon in Office 2013
Office 2013 users can also use Ctrl + F1 to show or hide Office Ribbon.
But if you are looking for menu option then click the icon at top right hand corner and select Auto-hide Ribbon option from the menu list
Quickly find out shortcut keys for Office Ribbon menus
Office 2013, 2010 and 2007 users can quickly find out the shortcut keys for accessing these Ribbon menu by either by pressing Alt or F10. When you press Alt or F10 then following Key tips will be displayed for each menu.
If you want to access Folder menu, then you need to press Alt + O.
And to hide the key tips, press Alt or F10 again.
Also See: Ribbon Display Options in Office 2013