The home screen in Pattern displays high-level data about the different lenses available to you. Within each section, you can note the total number of cases, active/inactive cases, number of documents, and total pages in that lens. Selecting "View" will take you to the Lens Overview for that specific lens.
Home screen example
To get there, log in with your credentials. If you navigate elsewhere in the application after login, select Lenses in the top left corner of the sidebar.
Pattern Sidebar