Start in the controls menu
Open Settings → Controls → Settings. The current Steam FAQ points players to the rotary-vehicle mouse controls rather than assuming the default aircraft profile is comfortable.
- Rotary Vehicle Mouse Control: enable when using mouse flight.
- Helicopter Mouse Swipe Left / Right: roll.
- Helicopter Mouse Swipe Up / Down: pitch.
- Invert Y Axis – Air Vehicle: match it to your muscle memory.