User Aircraft Dialog
The user aircraft dialog allows you to adjust a parameter that FSImp needs.
FSImp needs to know the lowest point of the currently selected user aircraft - usually the bottom of the under-carriage wheels.
A translucent yellow surface is shown and can be raised and lowered using the slider.
When you have approximately located the lowest part of your aircraft then close this dialog.
FSImp saves this value for each aircraft.
If you change to an aircraft that has not been measured then this dialog automatically pops up.
FSImp plugin for X-Plane