Please walk me through the procedure of automating hi hat decay over number of bars

Im able to get it to automate but when I pop back into the main screen my automation is only heard when Im in record mode, playback does not retain the motion (no playback override enabled)

i’ve only done record overwrite a couple times, never on envelope, but you’d have to have to enable it with B on recording, then adjust the decay and hit the pad at each trigger over the bars you want to overwrite

You mean A. And that is one way.
If you want to change every trigger in the pattern, hold A and press the pad.

I need to keep messing around with it I must be missing something… seems like maybe both A and B buttons need to be lit, but you cant toggle A from within the Env page.