The Subscriptions Dashboard is a "non-currency" dashboard. There are tabs across the top of this section that allow you to see the counts across all currencies or to filter the reports to show only a single currency. (If you do not have multiple currencies configured, these tabs will not be shown.)
If you are logged in with a Limited Agent role, this Dashboard will show only the customers associated with you and your Tracking Code.
The Subscriptions dashboard shows you the relative number of active subscriptions over the same time periods. The graph on the right shows the top 4 subscriptions by count and the statuses of each.
Clicking on the graph or the View Details button will take you directly to the Subscriptions report if you have sufficient permissions.