Since the creators update, my display brightness has been adjusted to 50% after each reboot.
I have to manually select the appropriate brightness every time and Windows will forget this setting every time I restart.
I am using a laptop.
I think, it is not related to the new feature "Night Mode".
Thanks for any help.
I got rid of the problem by freshly installing Windows and activating a Pro-Licence, not my Education-Licence.
Another potential Fix:
https://www.reddit.com/r/Windows10/comments/69l52k/potential_fix_for_auto_dimming_in_windows_10/