Unique metrics", like Frequency or Reach, can only be displayed at the individual ad level.
This is because the main report aggregates data by grouping ads (e.g., by ad name or creative). Since these metrics are unique and cannot be averaged across grouped data, they are only available in the ad breakdown view.
To view these metrics, you’ll need to add them in the individual ad view. Here's how:
Click into any ad group in your table chart by selecting 'Ad Breakdown.'
In the pop-up on the right, choose 'Custom' > 'Customize Tables.'
Add the Reach metric there to include it in your view!
