This optional property allows you to select a dashboard to be displayed when viewing audience insights in the Insights Window when the audience's audience definition has no dashboard specified (for more information, please see the Audience Designer documentation).
You can select a dashboard file, which must contain at least one Chart or Count Results widget. You can populate the property by browsing for a dashboard or by using drag and drop. Note that any count results widgets’ Display results as properties must be set to List of latest values. Once populated, you can open the latest version of the dashboard in the Dashboard Viewer. You can also clear your selection.