- Go to Contacts -> Search Contacts in the menu,
- Choose "View specific contacts from within the selected lists below",
- Select the list you want and click Next, and
- Choose the Activity Status "Unsubscribed" and click Next.
There is no way to set the Activity Status of contacts en masse. Generally there is a very good reason why a contact is labelled as unsubscribed or bounced, and changing this manually could result in your server being blacklisted.

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