Proximity screen off help you to turn the screen off when you don't need the screen to be on

simple UI ( no UI at all, only a single icon to start and stop ), tap the icon to start and stop
or adding the quick setting tile for android 7.0 and above

support Tasker plugin event to turn it on and off

Where to find the proximity sensor?
usually, it will be around the front facing speaker( the speaker that use for a phone call)

How does it work?
It works exactly like you did a phone call when you bring the phone near your ear the screen turn off to prevent any accident touch while maintaining everything working in the background

What situation will this app benefit us?
example
• When you listen to YouTube but you don't need to watch the video
• Playing a game for egg hatching, you don't need the screen to be on, so just drop your phone in your pocket the screen will turn off to save battery that using the screen