Spelling error in title 'watching'
I noticed this on the Mate 20 Pro also and it's the same on the P30 Pro. When watching YouTube, reading emails, reading docs - any activity really. I have to constantly unlock my phone because the phones don't register that there's activity. It's even doing it now if I pause too long typing this. It starts to darken very quickly and if I don't tap the screen it goes black and locks.
Is there a setting that I am overlooking? Gestures isn't what I want. It's frustrating to have to keep tapping the screen since it then displays the UI for the app that I'm using.