I don't know of a code (VCDS) to reprogram that -
Our delivery fleet has Mercedes Sprinter vans and drivers often get out the rear roll-up door rather than the driver's door - and there have been issues with 12V battery draining because the radio stays on overnight - like VW the radio looks for the door switch to signal "off".
I have sometimes stopped, popped open my door and then shut it again so that I'm able to have quiet as I get my stuff together before actually getting out.
Another option (in my car, 2019 SE) is to push the round volume button which turns audio "off" - but then you have to push it "On" again when you restart because the whole info cluster is powered off....