I don’t know how else to explain this. I shared my library with a friend and somehow their account became the master account. Anyone know how can I unravel this change?
Appears you joined their Plex Home.
Go to your account’s Users & Sharing settings to leave their Plex Home.
You appear to have added them to your Plex Home, rather than just as a Friend.
Go to Settings > Users and Sharing. You will probably see your friend’s avatar with the “crown.”
Hover over your own avatar, and click the ‘X’ at the far right. You should be prompted to confirm that you want to “Leave Home.” Say yes.
Ahh, beat me by mere seconds. 
Thank you, that worked great!
