Actually, the CSS you’ll need to add is detailed here. You’ll need to find the classname of your content wrapper. Feel free to send along temp admin access via private reply and I can get in there and add the required CSS if you like. There could even be a theme setting to apply full width, but not quite sure until looking.
I just went in to your site and added the CSS to make the pages full width when using BB. I just noticed you had another page builder installed. We suggest sticking to one as they tend to cause conflicts more often than not.