If you try to remote access a Linux application from your Mac, you will certainly face the following issue : Forwarded X application window will be limited to the two thirds of your screen.
So you won't be able to drag the window out of the two thirds of the screen.
The issue has been reported here https://xquartz.macosforge.org/trac/ticket/2116, the workaround is to disable the "Displays have separate Spaces" option in Mission Control Preferences on your Mac.
