When you leave your computer, you shouldto prevent other people from using your desktop and accessing your files. If you sometimes forget to lock your screen, you may wish to have your computer’s screen lock automatically after a set period of time. This will help to secure your computer when you aren’t using it.
When your screen is locked, your applications and system processes will continue to run, but you will need to enter your password to begin using them again.
Open the Activities overview and start typing Privacy.
Click on Privacy to open the panel.
Select Screen Lock.
Make sure Automatic Screen Lock is switched on, then select a length of time from the drop-down list.
Applications can present notifications to you that are still displayed on your lock screen. This is convenient, for example, to see if you have any email without unlocking your screen. If you’re concerned about other people seeing these notifications, switch Show Notifications off.
When your screen is locked, and you want to unlock it, press Esc, or swipe up from the bottom of the screen with your mouse. Then enter your password, and press Enter or click Unlock. Alternatively, just start typing your password and the lock curtain will be automatically raised as you type.
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