Hello, Donna!
Sorry to hear that you are experiencing that! Your computer/laptop settings will likely be where you need to change the settings to affect your Axxess screen and rest of your computer.
I tested it on my work laptop (Dell) and went to Settings>Display>Try the Brightness and Color or Night Light feature. You cannot customize the dimness on Night Light but you can under Brightness and Color. Hope this helps!
Thank you,
Kaylin