I have been designing my site on my widescreen laptop and checking it on my widescreen TV Monitor. I thought I set it to full width but when I checked it on a widescreen desktop screen I noticed that it is not full width. There’s a lot of space on either side of the border.
I then checked the Generate Press Theme home page and that was showing as full width on the widescreen desktop screen.
May I ask what width you have set the Generate Press Theme home page to?