The Activities section offers a means to only view certain types of leads.  When you click on the Activities option in the menu, you are presented with the following sub-options: Inquiries, Requests, Saved Searches, Properties, and Stage Changes

For each sub-option, you may filter the results using the search options found above the list.

Each sub-option is designed to show you which leads are responsible for the most activity during your selected date range. For example, if you click on the Inquiries sub-option, you will see which leads have generated the most inquiries in the Count column.

For any lead, you may click the arrow icon in the Action column to see a list of what is being counted.