How do you change the height settings for the off-road height?
I know how to change the normal height but that has no effect on the off-road level

I did not think you could adjust the heights independently with the IID tool, whatever you a adjust normal ride height to adjusts off-road by same amount, i.e. drop normal height by 10mm automatically drops off-road by 10mm. I believe there is aftermarket systems, Llams Height Kit or something like that being one of them, which allows you to adjust the height independently. Stand to be corrected though.

Cheers
Col