creating a 3 panel PDF, panels on the right

I’ve tried creating a 3 panel vertical PDF with the larger panels on the right side. This is the standard format for many of the main studios. I can only get a small image of the panels on the right. I’ve clicked the “display panel on the right”, “maximise panel height”, and “maintain size through scene”. All these options do not give me a simple 3 panel PDF with the large panels on the right.