Can my contacts unsubscribe to the Engage emails if they do not wish to receive them?

Yes! Every email contains an Unsubscribe link at the bottom.

Yes, every Engage email includes an unsubscribe link at the bottom. 

You can also unsubscribe users by selecting the Engage tab from your dashboard.

Next, search for the user using the search bar on the Engage screen. 

Finally, select the three dots to the right of their name to Unenroll the user from Engage. 

To learn how to view which contacts have unsubscribed from Engage emails, check out this article.