There are no width options for SiteBuilder Rows, but if you want the Rows to be full-width, you must make the container of your site to be full-width. If you want to modify the container to full width you can do that with this Custom CSS:
max-width: 100% !important;
padding: 0 !important;
Add the above CSS to your Child Theme’s style.css or in case you haven’t setup a Child Theme already, then you can also use this plugin to add the CSS to it: https://wordpress.org/plugins/simple-custom-css/ so you will not loose the changes on theme updates.
Please let me know how it works.