The airplane turn off displays after dusk - its related to sun position (time). I noticed that the knob of brightness of PFD change the moment to turn off panels (if brighter than later PFD is going dark).
For now the plane is unplayable in night conditions.
I just found that if you into the PFD settings and set the brightness to manual (it will be on auto for PFD and MFD) you can set it as low as 52%. If you try to set it lower than 52% it just goes black. I am assuming that “auto” is trying to set the brightness to some value below 52% after sunset, and that is triggering it to go black. So just have it set to manual for yourself and choose 52% or higher. This is quite bright for night flight, but it’s better than losing it entirely.