The Shut Down Windows dialog is what you see when you press the Alt+F4 keys without any currently open windows selected.
The Shut Down Windows dialog allows you to select from the actions below for what you want the computer to do.
Shut down is the action selected by default in the Shut Down Windows dialog, but you can change the default action if wanted.
This tutorial will show you how to change the default action of the Alt+F4 Shut Down Windows dialog for your account, specific users, or all users in Windows 10.