I was messing around with engine audio with the UI that shows up if you press F9, and now it keeps opening on its own after loading something. How do I disable that?
Press the 'Clear Defaults' button. You more likely pressed the Save Defaults button, which will open that menu automatically in the same exact state as when you pressed the button. This is handy for when debugging vehicles, as you don't have to re-open the apps every time you reload/change vehicle.