Remove Mailchimp tracking parameters from Google Analytics Reports
Have you noticed that analyzing Landing Page performance for your Email or Facebook ad campaigns is a bit tricky because these tools add click tracking parameters to the landing page URL?
To see if this affects you, log into Google Analytics and go to Behavior > Site Content > Landing Pages. Search/filter for mc_ or fbclid. These are common tracking parameters used the Mailchimp (mc_cid and mc_eid) and Facebook (fbclid).

Click tracking parameters like mc_cid and mc_eid from Mailchimp and fbclid from Facebook ads confuse Google Analytics into thinking that one landing page is actually many. Each URL appears different because of the unique tracking parameters Mailchimp adds to the URL to track subscriber click behaviour.
To fix the issue, log into Google Analytics and edit the View Settings in Admin. Add the mc_cid and mc_eid parameters in the “Exclude Query Parameter” box, and also include the Facebook tracking parameter (comma separated). It will look like this:

Hit Save.
Note: This fix only applies to future data, it does not alter the data retroactively.
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