I have the same system on my 2021 Essex. There is no way to disable the forward collision warning, however, I only get the beeps when i’m too close behind the car in front of me. Now there is a high/med/low sensitivity setting (per the manual) but I have not located it. On low sensitivity it doesnt beep until you are very close.
It also beeps if another car gets in front of you (which happens all the time). I can’t avoid that, but I do try to stay way far behind the person in front of me.
Hate to see you return the coach! Maybe just turn up the radio