The "Attendee Engagement (counts)" panel shows the number of times each item was used by Attendees.
To see fewer pie slices, click one or more items to remove it from pie chart.
For example, if you want the pie chart to only show the comparison between the number of Attendees that use "Phone Audio" vs "VoIP Audio", click all of the items (except Phone/VoIP).
The item(s) will turn gray, and will not display in the pie chart (see below).
Drill-Down to see "Session Assets Used"
Hover over the "i" (information) icon, then click on the link that appears...
This will take you to the "Session Assets Used" drill-down dashboard. It shows all of the typical Session information, as well as the Attendee who interacted with the Asset, the Type of Asset, and the "Name" of the Asset
On this drill-down dashboard, you can also filter for a specific "Asset Type"...
You can also export this list to a CSV/Excel file.
Related Article: How to Use The Engagement Analytics Dashboard