If unsubscribe tag {{email.unsubscribe_link}} is already present in the email template, the default unsubscribe link will not be added again.
Navigate to Settings -> Business info. Under the "General Section" you can find the settings.
Check/uncheck to enable and disable the settings
Can customize the default unsubscribe link
We are enforcing the unsubscribe links on all emails like:
Bulk email
Workflow
Email builder bulk sending
Except 1/1 conversations
