How do I adjust brightness of my Garmin XERO X1i scope?

The X1i has an ambient light sensor that automatically adjusts display brightness for you as conditions change. If at any time you don’t like the brightness, simply tap the UP or DOWN button (while on the Hunt screen) to change the brightness to your preferred level. If you want to turn auto brightness  OFF, go to Settings > Pro Settings > Auto Brightness and set the toggle to OFF.