Yes, you can set the daytime and nighttime nav screen brightness in the settings as noted above. There is a however...
There’s the knob on the instrument cluster which sets the instrument brightness, which you most likely are aware of. If you dial it all the way to the right (it rotates continuously), it will eventually beep, which sets the instruments and nav screen at full (day) brightness, regardless of the night/day selection.
So, set the nav screen night time level, and turn the knob to the point that you have full instrument brightness but does not beep, and the nav screen will use the day/night settings appropriately.
(this was the testing I did some time ago; I use full dimmed instruments at night, and full bright during the day, and use the knob to set that).
Thank you. I will fool with it a little more to see what works. Last night I found that by turning the knob on the instrument cluster to the right, the panel lights would only go to full brightness when it beeped and that also caused the nav screen to go to full brightness. One click to the left dimmed the nav screen but also dramatically dimmed the panel lights. I may have to live with this. Mostly an issue at dusk when I want the panel lights brighter, but then the nav screen is too bright.