I have a 4K screen, the GUI scaling only goes up to 1.99x if you go to 2x it gives you an error "invalid panel layout" and something else  but it flashes on screen to fast for me to see.

It also randomly resets itself back to 1 when resizing the window... 

So for now I turned it to 1 and then turned on System [Enhanced] DPI compatibility for it in windows and it works fine.