javafx graphic issues

[joejonsme]

Hi,

I'm new to the forum.
I have a problem with applications written in javafx for raspberry pi.
When I start an application in reality I do not see the usual window with the buttons at the top right, but the application covers the entire screen, with black background and I can not get out, if not "killing" the process by ssh. What could be the problem?

Please help.

I didn't find the right solution from the Internet.

References:-
https://bit.ly/2jPHj2w
Creative video agency

Thanks