This sounds like it would be more of a question for StudioPress as opposed to BB. The theme would be controlling the page template so I am assuming there is an option somewhere hindering it. I would recommend checking in with StudioPress to start and we can go from there.
We’re not really well versed with Genesis but there’s a tutorial from our very own Colin regarding this, just not really sure if it’s still working but you can give it a shot. And, as the name of the site suggests, it contains a lot of guides for the Dynamik/BB combo so I suggest you snoop around. http://dynamikbeaver.com/blog/set-dynamik-beaver-builder-full-width-rows/
Hi Noor - you really need to let us know what theme you are using.
This tends to be theme related - so without that information it is a little hard to guess ?
Let us know…
Cheers, Dave