This feature is available in Catalyst, Enterprise, and Ultimate editions.
When all the work has been done to complete a story/defect and no work remains, you can close it. Follow these steps to close a store or defect on a Storyboard.
Note that closing a story also closes all associated tasks and tests, and zeros out all remaining To Do.
Select Team > Iteration Tracking (or Sprint Tracking) > Storyboard.
In the top right corner of a story card, click the arrow to expand the action menu.
Select Close or Quick Close to automatically close the story.