The screen timeout is annoying when the display turns off while you are doing some meaningful job.
Go to the settings-> Navigate to the screen and brightness> tap on the Auto-Lock to visit the other display timeouts.
The background apps like timers or watches control the auto-lock since the phone believes them as an appointment and won't let the display turn off.
Undermine the Raise to revive component, this element turns on the display whenever you are choosing it up or keeping it in your hands.
If you are incapable to see the auto-lock settings on phone, rework the software and continue the phone to fix it.