This usually affects Linux users with a tiling WindowManager.
Please try the following command before starting the game:
If it works and fixes the game for you,
you should add it to .xinitrc to load this permanently,
In case it does not help, you are required to use the tool 'wmname' to spoof your window-manager to something supported. like: LG3D
Get and install the tool 'wmname' and then run:
and use the
java -d64 -jar StarmadeStarter.jar
Both solutions should fix it,
which one you choose is more a thing of your own system philosophy and comfort.