Reset display brightness to factory defaults A family member played with the display resolution and brightness settings. Fixing the resolution was easy, but it seems there's no way to restore default brightness. It's not a big deal (I just selected a brightness which is ok for me now) but I was wondering if in High Sierra there's a way to restore all the display settings to the factory defaults.

PS I'd prefer a solution which doesn't force me to reset all System Preferences to their factory defaults, just the display ones.

macOS High Sierra 10.13.5, MacBook Pro (15-inch, 2017)
Default brightness is just ‘Automatically adjust brightness’ enabled. The brightness is constantly adjusted based on lighting conditions. If you disable this option, whatever the current brightness is that was automatically chosen is saved as the fixed brightness, so there is no default value.