Go on your phone and disable text notifications to the Bronco. That should eliminate the chime so you will only have a notification symbol in the bottom right of the AA screen when a text comes through.
You can have mine, I have a 2023 base with a working sub and amp that I'll be replacing with aftermarket. DM me your address and I'll send the sub, amp, and enclosure if you want them.
I can confirm that even when hitting OK to return back to sport mode, the transfer case shifts back into 4A despite parking it in sport w/2H. I assume when you hit OK to return its the same as turning the GOAT dial to whatever mode you selected before.