The LG can also automatically adjust the brightness of the screen to maximize battery life by adjusting the brightness according to the ambient light.

Android 9 | LG UX 9.0
Adaptive brightness -  Open the  Settings
Adaptive brightness -  Tap on  Display
Adaptive brightness -  Enable or Disable  Auto
  1. Open the Settings
  2. Tap on Display
  3. Enable or Disable Auto

LG Instructions