Central Administration and Site Settings the SharePoint way: /_admin/default.aspx with its 8 category pages and /sites/X/_layouts/15/settings.aspx, every heading a CustomActionGroup and every link a CustomAction (Locations Microsoft.SharePoint.Administration.* and Microsoft.SharePoint.SiteSettings, GroupId). Today admin is scattered over /admin, /admin/*, /_admin/sites/X/settings and /_layouts with bespoke layouts and no SharePoint URLs. Operator approved the new CustomActionGroup kind 2026-09-25.