The only setting that might be incorrect would be perhaps the brightness/contrast setting on your monitor.
As far as brightness at night, it really depends on cloud coverage and the phase of the moon. When it’s a full moon, it can almost seem like daylight outside. It can also depend on the sensitivity of your own eyes, as well as the light pollution around you and how long your eyes have had to adjust to the darkness.
That’s why lighting is often red in the cockpit, as red wavelengths don’t cause your IRIS to expand as much as other wavelengths. Typically before I go flying at night, I’ll give my eyes a few minutes to adjust to the darkness, and keep the lighting in the cockpit as low as I can while still being able to read the gauges.
It’s also a good idea to only use the 1st level of brightness when clicking on the runway lights when they’re off (I could swear FS used to allow you to do that, too, I miss having comms for multiplayer built into the game)… eek, I was flying into KCON at night, and those strobes on the approach on the top setting were killing my eyes! I was glad when I got past them and could see the runway again