@Alexander: If you just want Full Width layout then you can go to “Appearance => Customize => Theme Options => Layout Options” and in “Default Layout” you need to select “No Sidebar, Full Width”, also you can edit this layout in individual page and post using Catch Adaptive Options metabox layout options.
But if this full width is not enough, then you need to increase wrapper, for that you can add the following css in “Appearance => Customize => Theme Options => Custom CSS Options” box:
.wrapper { width: 100%; }
.
