Can't add any files to IntelliJ IDEA (on MacBook)

Hi, I have problems with adding any files from laptop. I need to add some files for working with JavaFX. I saw some articles what I have to do for it. When I want to add something from disk the action is not completed. The one thing what I can do it is add something from Maven. The same situation with JavaFX Scene Builder 2.0. I know that I need to add it in Settings/Preferences> Languages and Frameworks> JavaFX.
But just I choose the way to it the action is not completed again. It looks that it doesn`t operate properly.

Maybe I did something wrong? 

P.S. macOS Catalina(beta), IntelliJ IDEA Ultimate.

Thanks in advance.