how to do a optimization for Facebook DPA ads

what I mean is If I have 100 products in my product feed, how do I know which product perform better, which product completely no sales and it should be deleted from my feed, you can do that easily before IOS 14, facebook will show you all of the data, but rightnow, everything is gone, how to do that please

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you might still be able to pull that in reporting. you would have to create a custom report and look for ad/product level breakdown.