How to log off, lock or switch user account in Windows 10?
Log off is now called sign out in Windows 10.
And switch user account cannot be found in Windows 10, all you need to do is click on the user account that is available on the start menu.
If you cannot find any other user account, then you might need to create another account if you need it. Multiple user account is good if there are multiple users on the laptop or computer, or simply you just need to separate your files or prefer to have another account with less clutter of icons on desktop.
See screen shot below, just click on the user account just below the sign out option and Windows will automatically switch to that user account.
Press the Windows icon to open the start menu and other tiles options.
Just a quick tips on windows 10. Cheers. Hope it helps.