Unable to change ACCEL_Z_P, value

I have aquired a Align 550E Trad helicopter, thatI have I fitted a Pixhawk to, Now I am setting it up. I tried to reduce ACCEL_Z_P, 0.05 down to 0.02, with no sucess. I’m running the latest firmware 3.5.

Solved. I downloaded the latest version of Mission Planner, all working as it should now.