On the Breakdown-page, you can break down the statistics of your ads on an interest-per-interest level.
These statistics are only possible for ads. They cannot be received for Ad Sets or Campaigns as a whole, as Facebook does not share that data.
Here are the statistics we’re able to provide (on a interest-by-interest basis):
Moreover, you can also remove any interests from your ad set using the “ Remove from Targeting” button.
In the video below we'll explain more details about the Breakdown Page:
In case, you may have problems showing up your Breakdown Statistics, you can refer to this article for more details: Why are my breakdown statistics not working?