This isnt exactly the same ting you are talking about. But I had to edit the text file to map my mouse and keyboard, since I couldnt do it form the ingame menu.
Since you say you lean the stick left and you go right, you lean the stick right and you go left, I would.....
Go into your PROFILES folder and find the controls file. Open it with notepad and find where it is talk about your airplane controls. In that section, find where it talks about "controller inputs = right and left". Then I would just manually copy and paste and switich the two inputs (the motion of the stick) or outputs (the outcome of moving the stick) of the command lines. Save and play.
I suggest you copy and paste the file before you mess with it. In case something messes up, you can replace the now, messed up file with the orginal file.
Since you say you lean the stick left and you go right, you lean the stick right and you go left, I would.....
Go into your PROFILES folder and find the controls file. Open it with notepad and find where it is talk about your airplane controls. In that section, find where it talks about "controller inputs = right and left". Then I would just manually copy and paste and switich the two inputs (the motion of the stick) or outputs (the outcome of moving the stick) of the command lines. Save and play.
I suggest you copy and paste the file before you mess with it. In case something messes up, you can replace the now, messed up file with the orginal file.