zorin 9 - primary screen?

I have 2 screens, one 27 inch and one 23 inch to the left of it,
I'd like to change zorin's settings to reflect this, however when I do the taskbar gets moved across to the smaller screen rather than the larger one, how do I prevent zorin from doing that

I would swap the screens around, but have a very unusual and cramped setup in my room, half my desk is blocked by my bed, I'd prefer to have my largest screen in front of me