Gregjet , couldn't post the direct link because it was part of a lengthy post on the XV forum, but does your model have a switch like this?
"I don't have nav so my experience isn't going to be super helpful..
With the dash dimmer just to the right of the steering wheel next to the headlight leveler.
When on 0 everything is on full brightness, 1-5 mfd dims to a preset level and doesn't change with the dash lights. the dash lights, radio and steering controls all dim slowly from 1-5 (due to the red I mostly like it all the way down) needles never dim
Now you can set the brightness of the mfd separately. Moving or stopped.. Hold the set button then for memory push set on the display menu, then brightness, then you should be able to set it. (No idea if it has a setting for night and day) but it does go very dim.. Maybe that will help enough that it is more bearable. Good luck"
Best regards,