If you leave your computer for a few minutes, the screen will automatically lock itself so you have to enter your password to start using it again. This is done for security reasons (so no one can mess with your work if you leave the computer unattended), but it can be annoying if the screen locks itself too quickly.
To wait a longer period before the screen is automatically locked:
Open the Activities overview and start typing Screen Lock.
Click on Screen Lock to open the panel.
If Automatic Screen Lock is on, you can change the value in the Automatic Screen Lock Delay drop-down list.
If you don’t ever want the screen to lock itself automatically, switch the Automatic Screen Lock switch to off.
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