What step should be taken to view performance data for targeted audience segments?
Go into the insertion orders default targeting and use the potential reach metric
Generate an audience performance report and select “include only targeted audience lists”
Generate an audience composition report and filter for line items targeting audiences
Generate an Inventory Availability report and filter by all targeted audiences
Use the Audience Performance report to see how well your line items performed for the various audience lists available in Display & Video 360. This report is not available for TrueView line items.
This report looks at all the users you reached, and groups your impressions, clicks, and conversions by the audience lists those users were in. This includes not only first-party lists, but also third-party lists. To view performance data for targeted audience segments, you need to generate an audience performance report and select “include only targeted audience lists”
Read more here: https://support.google.com/displayvideo/answer/2650629