Regions in GovCMS
Besides its primary content, a web page contains other content such as site branding (site name, slogan, and logo), navigation aids (menus, links, and icons), formatted text and images. Each theme provides a set of named regions, such as Header, Content, and Sidebar, where site builders may choose to place their content.
The available regions depend on the theme design. Only the Content region, which contains the primary content, is required; others are optional.
Regions can be displayed by hovering over Structure on the Admin Menu then clicking Block layout.

Image of Block layout
Once at this page, click on the Demonstrate block regions (Olivero) button.

Image of Demonstrate block regions