The screen brightness can be adjusted manually on the LG unit, and by default, the change can be made using the quick settings or the normal display settings.

Note: The screen puts the most strain on the battery; the brighter the screen is set, the shorter the battery life.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Move the  slider  to adjust the brightness
  1. Open the Settings
  2. Tap on Display
  3. Move the slider to adjust the brightness

LG Instructions
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