No option for setting difficulty level

Thanks Mike, I wasn’t connected as a controllable! … as obvious as that seems. Initially, it wouldn’t let me connect as controllable until I unpaired my Garmin Vectors for the cadence. I now have my Kickr as controllable, and can finally experience -/+ tension as I am riding now! The difficulty slider still doesn’t appear with the Zwift App, but I will tackle/enjoy one thing at a time here.