Yes, I just figured it out ... after reformatting my drive, reinstalling windows and Pro (a waste of time that was!) ...
It's a High DPI Monitor problem. Here's how I fixed it:
Go to Start Menu, right click on ArcGIS Pro icon -> More -> Open File Location
Right click on the ArcGIS Pro shortcut -> Properties
Click the "Compatibility" tab
Click the "Change settings for all users" button (at the bottom)
Click the "Change high DPI settings" button (at the bottom)
Select (put a check in) "Override high DPI scaling behavior"
Select "System" from the dropdown
OK,ok,ok
It took me 3 weeks to figure that one out, after spending 3 days reinstalling everything ... aaaarrrgh ...
I've attached an image that shows the dialogs ...