You can find your Pinned List reports under the Additional Tools Dashboard.
The reports are broken down into three parts.
Pinned List Engagement: indicates the number of sessions with active pinned lists.
Items Added: shows how many times the pin icon has been clicked to add a product to the pinned list.
Items Clicked: the number of products that have been clicked on the pinned list.
The last two reports have two linear graphs. Items refer to products added or clicked to/through the pinned list, and sessions are the number of sessions per visitor.