OPPO A57 4G
Android 12.0
1 Turn on the screen lock
Press the Side key.
2 Turn off the screen lock
Press the Side key and slide you finger across the screen.
3 Set automatic screen lock
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Display & brightness.
Press Auto screen off.
Press the required setting.
4 Return to the home screen
Press the Home key to return to the home screen.