I don't Multibox anymore, and chose not to use Pitbull, but unless it has changed, it is in the RAID section of the menu. There is a checkbox called something like "Single Party Raid Mode" or something to that effect. It may be a pulldown menu, I can't remember exactly.

All I remember is having the same issue as you when I first Multiboxed with the new BG settings (where they force you into a raid) and my whole UI went bonkers.

But there is a setting there somewhere in the RAID or RAID PARTY section to make it so you only see your current party.

Pitbull is a total pain in the ass to get configured the way you want it, but in the end, it is by far the most customizable and multiboxer appropriate Unit Frames out there.

Lokked