If you are going to stop working with your computer for any length of time, you can safeguard your information and save power in a number of ways:
If you want to prevent passersby from seeing what you’re working, you can lock the computer, which displays the Welcome screen and requires that you log on to your account to resume. Locking is most effective when your user account is protected by a password; otherwise anyone can click your user account picture to unlock the computer and access your information.
You can have Windows lock itself by configuring a screen saver to start after a designated period of time and to display the logon screen when you resume your computing session.
For information about configuring ...