Board Game Arena

OK,I found where to stop someone being invited to every game, so the main deal is done. But is there a way to uninvite someone before a game starts, or you have to cancel it and start again?

I have a situation where on every game I start, someone is invited to that game (same person each time). Feels like it might be a setting somewhere, but I haven't found it, or seen it in the FAQs etc. Alternatively, if they have to be invited to every game, how on earth do I remove them? There seems...