Window size button missing in the upper right corner

[Carrast]

Hello Everyone!

I like to work on GDL objects with smaller window size, so i can easy switch between them. However these window size handling buttons are missing in the upper right corner, even is the latest AC28 build. But they are actually there, you can click on them, and they function as intended, so you can minize to tray, resize and close them. If you try to click on them, you will see it!

See images. 

Thanks

[Lingwisyer]

Assuming you are running Dark Mode: https://community.graphisoft.com/t5/Modeling/Missing-Sub-Window-Diplay-Buttons/m-p/628554/highlight/...