Hi
If there is no way within the theme options, it could be done by making a child-theme and altering the css
There is a number of div ids and classes that look as if it would be possible. The div id “page” is one. Look at the preview example and inspect element in the Chrome browser. If you are in Firefox you will need to have the equivalent add-on installed. By making the page id have a width of 100% you will be able to see it gives a full width on the screen.
This would then need to be added to the child-theme’s style.css file. You would also need to check if margins or padding of other ids or classes need to be altered to suit your needs and obtain the correct look.
I hope this helps.