In this panel, you can enable XML Sitemaps for your collection.
If you are looking for a human-friendly sitemap instead, check here: disp = sitemap.
If checked, you can access the standard XML sitemap of your collection using the URL:
https://your-site.com/your-collection-name/?tempskin=_sitemap . For more info, see: Publish an XML Site Map.
The option is checked by default for public collections. It should not be checked for private / members-only collections.