Multicam source monitor layout or zoom?

Sorry if this has been asked a million times, but is there ANY way to either cut down the amount of multicam spaces in the source monitor when using an even number of cameras? Or just zoom in to cut out the dead space? I see there's room for 4 cameras but I'm only using 2 and so I'm just wasting a giant chunk of my monitor space when working. I feel like I'm missing something obvious and can't figure it out.

Please help!