Large UI on 4k Resolution
I have a MacBook Pro early 2013 so I have to drive my Cintiq Pro 16 at 2k.

I think on 4k, Mac OS knows scales UI bigger, because otherwise it would be too small (imagine those 2k Interface Elements at about half the size).

Its probably an issue with the Wacom Driver, that makes it impossible to scale the Interface at 2k.



Do you have scaling options for the Cintiq on 4k? If you do, its probably a Wacom Driver issue.

I recommend to post a topic on the official Wacom Forum. The Wacom Staff answers really fast.
http://forum.wacom.eu (Wacom Forum Europe)