Perspective View not full screen on Page

Created a new page with custom borders for the top, bottom, left and ride side docked views. When viewing the page in a perspective session, the main view doesn’t seem to maximize and there’s empty space around the main view. Does anyone know what might be causing that?

If it’s a coordinate container, is it set to relative mode? Also, is it locked to a specific aspect ratio?

This is a coordinate container, but its set to fixed mode and is not locked to a specific aspect ratio. What would you suggest to fix this?