Fairphone 4 has an Adaptive brightness feature, and it will optimize the brightness of the screen according to your activities and your environment.

• To enable the advanced brightness, go to Settings → Display → and turn on Adaptive brightness.

You can also dim the brightness level of your screen manually. To do so:

1. Swipe down, twice, with a finger from the top of the screen. You will open the pull-down Quick settings menu.
2. To dim your display, slide the little Sun icon to the left. The A icon next to it is a shortcut to enable or disable the Adaptive brightness.