Recently I keep getting put (automatically?) into multiday basic quickmatch games with newbies. I don't want to play these games and I get booted. I must have changed a setting somewhere but I can't find it. How do I turn off this feature?

Select Quickmatch under multi-player. You'll see the option to control it.

Thank you, that looks like it. I don't remember ticking it. Oh well. Cheers.