SELECTED ANSWER
replied on November 30, 2020
This feature does not allow you to recover terminated instances. This is about allowing a submitter to recover a form submission immediately after submitting it if it runs into an error.
If a user fills out a form and clicks submit, they generally get sent to the thank you page to let them know the form was successfully processed. If there is an error in the submission (due to the user not being logged in, a validation error, or a change in the form while they were filling it out), instead of the thank you page, they are sent to an error page where they can click Recover Form to go back to their form. They can then fix the issue by signing back in, fixing the bad field value or re-submitting an updated version of the form, without losing all of their data.