https://ldx.community/snippets/learndash-notifications-email-remove-unsubscribe/
LearnDash Notifications: Remove Unsubscribe Text from Email - LDX Community
If you're using the LearnDash Notifications add-on, every email has an unsubscribe link in the footer. More specifically, the text at the bottom of the email
text from emaillearndashnotificationsremoveunsubscribe