Hey Jwoodisgood,
first of all, thank you for the purchase!
Full-width content is not envisaged in Kanso for one-page website mode, for the sake of visual uniqueness. However, since the customization is a relatively easy one I’ll try to provide a solution: please download this custom file, unzip it, and upload the contents into the root theme folder (/wp-content/themes/Kanso/). Then refresh the website and let me know if the changes work.
Sincerely,
Andrii / Satori Studio