[ALUG] How to disable headphones mic autodetection?

Hi All, I know this might be a bit too late, as we are all supposedly finishing with lockdown, so no more online meetings and video calls but it really bugs me. Whenever I connect headphones to my Linux Mint, pulseaudio forces use of headphone mic (which does not exist). This disables internal microphone and I have to go to sound hardware selection to change to internal mic array. Same happens on my kids laptops running Mint 20.1 (my is Mint 19.3). I think there is a priority setting somewhere in pulseaudio config which should allow to 'lock' mic to the internal array but I thought I'll ask first. Cheerio! Bart