Default Party Frames in Arena TBC

Hey, on retail for the last decade I’ve used default party frames when not in a raid. This includes in arena. However, in TBC arena it seems to be considering it a raid and its turning on the raid frames. Does anyone know how to force arena to use the default party frames?

As I said for some reason this has never been an issue in retail arena for me.

If there was a way to only make the raid frames activate in a raid of size >5 then that would probably do it.

Thanks