When a desktop-scale is set (for example 200%) window-screen doesn't scale correctly.
All Gadget and the window is scaled correctly and work, but the window-screen is simple not scaled and only 1/4 (the left button corner) is filled with the graphic.
Simple run the openwindow-example from the pure-basic installation.
https://imgur.com/a/JrEJNq7
Surface Pro 6 - with current Linux Mint.