Thank you for the answer!
Yes, I'm sure, because I uninstalled and installed it again (twice). And it still doesn't work.
When I try to press any button or switches, there is just no click-spot!
When I start my flight on the runway, I can fly with my Joystick, and the plane flies very well!
Here is a link to a Video I made to show you! Unfortunately, the Video is too big to upload it here!
https://drive.google.com/file/d/1rTfqhjCMInm1XK3izU4RRYIslg2zLu6e/view?usp=drive_link