@Min_Yu to my understanding, this functionality is not currently set up in LFX. We had the capability in the UX previously, but it was not updated with the move away from the Salesforce and transition to HubSpot. For those wishing to subscribe or unsubscribe to specific emails, there should be a link available at the bottom of any emails that go out from the LF or Projects that originated from our HubSpot system. Users clicking on the “subscription center” link at the bottom of those emails, will go to a page that enables them to select or deselect the emails they receive.