The two layouts we recommend and support are the content+sidebar, and the full width content layouts:
- Content+Sidebar (seen here)
- Full Width Content (seen on the homepage)
Previous versions of the theme supported a wider number of layouts, but over time it became clear that these provided little to no benefit while creating huge amounts of complexity and maintenance issues.
Custom layouts can still be created and implemented by hiring a developer, who should be available to help maintain them for years after they're created.