Technical requirements
Some features, such as Comparative Reports, are more advanced reporting features, so to access these, you will need to be on a Premium plan or using the Mailchimp Pro add-on. The Comparative Reports feature is not available with Mailchimp’s Free or Standard plans. Additionally, if you have not yet sent a campaign, you should at the very least send yourself a campaign so that you can see a campaign report in your account to follow along.