Go to Matomo. In the menu click Behaviour and then Contents.

Content Name report

The list of all your Content names along with the metrics Impressions, Content Interactions and Interaction click rate (%).

Matomo Analytics (formerly Piwik Analytics) tracking impressions Clicks Click-Rate on banners and any page elements

Each Content Name can be clicked to view the list of Content pieces with this name:

Content Names Content Piece report in Matomo

This lets you see at a glance all the elements you may be measuring (banners, listings, thumbnails, etc.).

Content Piece report

The list of all your Content pieces along with the metrics Impressions, Content Interactions and Interaction click rate (%).

Matomo Contents Tracking Content Piece report

Each content piece can be clicked to view the list of Content Names for this piece.