By default, the Oppo smartphone's screen automatically goes into hibernation mode after two minutes, but to adjust the time until the display goes out, the so-called screen timeout must be changed.

Oppo offers a setting between 15 seconds and 30 minutes for this purpose. The screen cannot be switched on permanently.

Note: The screen timeout only starts running when no touches are made on the screen and no media app is used.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Display & brightness
Step 3:  Tap on  Auto screen off
Step 4:  Choose desired  Timeout
  1. Open the Settings
  2. Tap on Display & brightness
  3. Tap on Auto screen off
  4. Choose desired Timeout

Oppo Instructions