In Open Berkeley, the Hero (i.e., full-width) options have been the Hero Image and Color Band widgets, added via the “Customize this page” button at the bottom of the Landing page content type.
In Berkeley Web Builder, there will also be Hero Image and Color Band options, but they will be added to Custom pages differently than Landing pages in Open Berkeley. Since the Hero is for the page title area, the Hero Image or Color Band will be added and configured in the “Edit” tab of the Custom page (rather than being added as a separate widget). There will also be an additional Hero option called the "Call to Action," which will be a color Hero with a "Learn More" button.