Why it is not possible to collapse non-started sprints on the Rapid Board? (or, at least, I did not find any obvious way to do it). Suppose that you plan for several sprints ahead (start populating their content in advance). Dragging and dropping issues from the very bottom of the list (Backlog) across miles of the expanded sprint backlogs becomes just unbearable. Collapsing sprints would have been such an obvious answer