I'm unable to find how to set a staff room to franchise Staff at this moment. I think maybe in the UI overhaul it might have been forgotten? I know it used to be an option but not anymore now. If they're not supposed to have a staff room anymore, pls say so in the changelogs, cause i can't find any mention of a change to franchise staff rooms.
I'll include a savefile, in wich i should have an old staff room wich was appointed to Franchise staff if you need something like that, it is the room selected on the screenshot