Multiple Master channel strip in Logic

I'm using Logic 11.2 and for the first time using it in 15 years I have in my mixer window an additional Master strip channel. Where did this come from, how did I activate it, or is this an glitch in Logic? I've never used or needed an additional Master channel so I must have done something to have it now show up. I've gone through every menu item and can't find anything to remove it. Any suggestions?