Currently, you must archive members in Mailchimp directly.
If you need to archive a member, you can quickly access their Mailchimp record from the Member Detail. This can be found in the Audience member list or on our Memberships component. Please see the arcade below for the steps.
Note that the Archived status will not be pushed to Salesforce until the primary sync is next run (by schedule or manually) or you refresh the component as shown.
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