Customize the Collections list template with built-in settings, then enhance the template with additional sections. To add sections, first confirm you are using a compatible version.
Confirm your theme is compatible
Add section to the collections list template
In the theme editor (Customize), use the page selector to open Collections list.
In the left sidebar, click (+) Add section.
Select one of the available sections. Use the search field to search by section name.
Themes with numerous sections will only show some of the sections immediately. To reveal additional sections, select Show more.