What information is displayed in What are our project overlaps?

A filter setting is mandatory for this business question. Click the Filter local filter button and select a project in the Project field.

Here's how to interpret the information:

The lanes indicate the object class of the IT assets that are impacted by the project. These could be business capabilities, business processes, applications, components, information flows, or organizations.
IT assets showing a symbol indicate that the IT asset is affected by the project selected in the Project field.
IT assets with number symbols indicate that the IT asset is affected by one of the projects selected in the Overlapping Projects field. Click Show Legend to understand the numbers added to the IT assets.
An IT asset highlighted red is affected by multiple projects and requires attention. To understand more about the project overlaps, click the IT asset in the matrix and click the navigate button to open the content area. Go to the Investment Context page and scroll to the Impacting Projects view to understand all projects impacting the IT asset.