I have the same problem on an iMac 5K. The higher pixel density seems to be ignored, so I only see the left bottom corner of the screen (just like jr_grzy's and JaydenIrwin's screenshot).
It got broken somewhere after 12-03-2019 (March 12). That's the last time I played it without this problem.
Way to reset Window Scale Factor
in Problems, Bugs and Feedback
Posted · Edited by bbb
I have the same problem on an iMac 5K. The higher pixel density seems to be ignored, so I only see the left bottom corner of the screen (just like jr_grzy's and JaydenIrwin's screenshot).
It got broken somewhere after 12-03-2019 (March 12). That's the last time I played it without this problem.