[@roofoo] With a 3840×2160 UHD display, I had to adjust the “Properties” of the desktop shortcut to enable proper display:
Right-click on the shortcut for AbstractCurves, select “Properties”.
Select the “Compatibility” tab.
Under “Settings” check the box for “Override high DPI scaling behavior”, then in the pulldown selector “Scaling performed by:” choose “System” (which worked for me).
Click on “Apply” then “Close” and relaunch the program.
Hopefully that fixes it for you.
Otherwise it would appear as a very small window with very tiny fonts.