My 9.0 version of Protean allowed my cover image to be 100% wide. Without the body to be so wide.
I've now moved on to 10.0, which shortens the image width to the same size as the body.
On my home page, I need a large margin on either side of the content. Say, 75% for the body. Otherwise, some of the lines are so long that they are not easily read. But I need my cover (image) to be 100% wide, as before. Just as the top header is 100%.
What is the best way to accomplish this in such a way that it will not interfere with future upgrades? Is there a setting for such an adjustment? Where?