Big gap between mixer and control room?

Apologies if this has been covered elsewhere, I couldn’t find any info on this.

I just installed Cubase 7 on my mac and loaded a project I’m working on. I included the control room in the mixer instead of as a separate window. Now I’m seeing a 2" gap between the right edge of the mixer and the left edge of the control room section. If I resize the control room, this gap is preserved. If I remove the control room, I see a gap between the right edge of the last mixer channel and the edge of the mixer. There’s nothing in this gap, just black space. Can I make it go away?

A screenshot is attached so you can see what I mean. Thanks!