Thank you for reaching out to the Community with your feedback. The good news is Constant Contact does actually offer the ability to do this. The Update Profile Form available in your account under “List Growth Tools” is what offers this ability.
As long as your contact lists are selected as an option on this form, contacts can unsubscribe from just one list rather than the whole account. Here is our helpful FAQ on how to customize your Update Profile Form so customers themselves can subscribe or unsubscribe from specific lists.
Thank you for coming into the community! The update-profile form can be linked automatically from the footer of any of your email campaigns, in addition to the update-profile form affecting what people see when they click the 'Unsubscribe' button.
The 'Update Profile Form' does not have a link available outside of the footer of your emails. However you can create the same information requests, and list options on another Landing-Page Sign-Up form, and link to that Sign-up form instead. Instructions on how to link to any of your Landing-Pages can be found here.