Just flight plane default views
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The simplest way to revert any changes back to their default state will be to uninstall and reinstall the affected aircraft.
To do that, first find the affected aircraft in your X-Plane 11 > Airplanes folder, then delete that aircraft's folder, re-download the aircraft from the store you purchased it from and finally drag and drop the new folder into the X-Plane 11 > Airplanes folder.
Mark - Just Flight