Many projects has been using JIRA for a while, and I have started to track flow metrics. The cumulative flow diagram (CFD) could have been useful, but what I see is mainly a pile of closed issues, and a thin border representing the To Do, In Progress, and so on. Is it possible to hide older issues from the view so that the work flow is more visible? I couldn't find it; I only saw filters per user or per column, swimlane, or quick filter. Is quick filter the only way to achieve this? Thought the need would be more common.