And I don't mean the Screen Timeout or the actual phone lock.
I have a Samsung Galaxy A8 running Android 9, and since I found out it hasn't been updated since 2018, AKA before OneUI, I decided to do it.
But since that update, when I don't touch it for a bit, LESS than the ten minutes I set the screen timeout to be, the phone screen get dimmer and lock itself with a 'drag to unlock' message.
It is annoying as I am using a third party program to help me grind in a mobile game, and what it feels like every five minutes I need to unlock the phone screen so that it can keep working. The screenlock must be new because it didn't happen before I updated it. I tried to see how to turn that off, but all I find is the Screen Timeout and the phone's actual lock, same for google searches. I can't find ANYTHING on this screen lock.
Hell, even the 'Don't go to sleep while plugged it' dev setting doesn't stop it.