I had a problem that in full screen mode the game would launch then minimize and not allow me in. I could enable Cockpit displays to external windows and the game would launch and work. This is repeatable.
I disabled Samsung Magician (an app for my SSD) and everything works. For whatever reason Samsung Magician conflicted with Falcon full screen. Look to disabling all apps that you can if you haven’t already. It could be something this odd.