Do you imply deletion like shown in the picture?
You removed our entire local preferences folder, which is supposed to store preferences for all our products. That's obviously wrong, and not what I've said. Doing this, you lost all your customized GSX airplanes, and all your customized GSX airports, on top of any other preferences by other FSDT products too, such as CYVR, XPOI, etc.
I've said to Reset the airplane configuration for the airplane that didn't work. There's an option for that in the airplane configuration editor.
Now, it's best if you reinstall GSX and any other FSDT products, since you removed all their preferences, and some of them are created at install time.