How do I toggle between sides on the interview layer?

I am trying to set up a split screen podcast. I use the interview layer with two cameras connected via USB. I have no problems locating the cameras. What I do have a problem with is accessing the left side versus right side. As of right now I can only change the settings for the right side (B). I can not figure out how to switch to Left Side (A). Can anyone help me figure this problem out?

The left side is simply everything which comes from the layers below the interview layer. So to change the left side you have to change the content of the “Placer Layer” below the “Interview Layer” which renders your USB camera A. If you don’t have anything under your “Interview Layer” you have to add a “Placer Layer” below it and select the desired video source here.