Can't find INAV_TC_Z

I have a drop after going forward in althold.
I need to change my thr_mid and maybe the INAV_TC_Z from 5 to maybe 6 or 7. I can’t find the option if I search for it in the full parameter list. Why? I do have ac 3.3.3 and mission planner on windows. My fc is a pixhawk from 3dr x8+ copter.



Is this parameter helping to avoid a drop after releasing the sticks in althold.