Are you on Steam or Microsoft Store version?
Steam
Are you using Developer Mode or made changes in it?
No
Brief description of the issue:
I am unable to select any multiplayer option in the flight menu. I was trying to install the AIG traffic tool and then this happens. I remove it from my community folder but it is still unselectable so I remove all items from the community folder but still nothing.
Is there a cfg file somewhere to return it back to normal?
Provide Screenshot(s)/video(s) of the issue encountered:
Try turning off multiplayer in the last menu, apply, quit the sim and relaunch, then reset your settings, that should fix it. If not hit it with a hammer ;p ← disclaimer: dont really hit it with a hammer we were just joking.