I think you should follow these steps:
Access Reporting or Analytics: Go to your email marketing tool's analytics or reporting section.
Select the Specific Message: Choose the campaign or message for which you want to track unsubscribe clicks.
Create a Segment: The segmentation feature filters users based on their activity. Look for an option like "Clicked a specific link" or "Unsubscribed".
Filter by Unsubscribe Link: Specify the unsubscribe link as the link clicked. This will narrow down the users who clicked on that particular link.