Premiere CC Change number of cameras shown in multicam edit

How can I change the number of camera preview screens shown in the Project panel when in multi cam editing mode?

I only have 5 video tracks in my multi cam sequence, but in the project sequence it shows 9 previews.

I have premiere pro cc 2019

Or maybe I'm not wording this right.  How can I remove so much black space there so my cameras that do show are larger?