At the ESRI Fed Users Conference I picked up the tip that Filters can be turned on and off by clicking on a item then off by clicking in the empty space of the graph. However this is not intuitive for people using the Dashboard. There is also not an indicator to show that data is being filtered or by what. The Dashboard talk stressed the importance of using limited filters in Dashboards. However, it would still be very useful to have more of an indicator of when a filter is enabled and a more obvious place to disable filters once you are done.