All lists in ActiveCampaign have a default Unsubscribe page. You can specify a custom URL to direct contacts to after they click the Unsubscribe link in any email.
To customize your Unsubscribe page, select “Advanced Settings” from your list’s options menu:

To learn more about managing unsubscribed contacts, read this guide.
For instructions on how to redirect contacts to your website after they click the Unsubscribe link, read this Help article.