Each backlog lists a filtered set of work items based on the team's selected area path, iteration paths, and work item types.
Product backlog: By default lists User Stories (Agile), Issues (Basic), Product Backlog Items and Bugs (Scrum), or Requirements (CMMI). Provides options to show Parents, Forecast, and In Progress or Completed child items.
Portfolio backlog: By default lists Features (all process models) for the Features backlog, and Epics (Agile, Scrum, and CMMI) for the Epic backlog. Provides options to show Parents and In Progress or Completed child items.
Sprint backlog: By default lists all product backlog items assigned to the selected iteration, regardless of status. Provides options to show Work details.