There is a problem with minimal brightness in Nokia 7 Plus.
If you have novatek controller it won't get dim below 16% on brightness slider.
Here is the comparison, left one is "Novatek-V07" right one is just "07".
This makes the device unusable at night.
I've send mine for repairs and got it back unrepaired with reason: Fault not found.
Support is only telling to reset the phone to factory and see if it works then.
Nokia, release some firmware update to fix this issue please or accept the phone for repairs.