If your repository requires reviews, you can dismiss pull request reviews that are no longer valid or are unable to be approved by the reviewer.
If a person who requested changes isn't available to give an approved review, or if a pull request has changed significantly since it was reviewed, repository administrators or people with write access can dismiss a review.
This changes the status of the review to a review comment. When you dismiss a review, you must add a comment explaining why you dismissed it. Your comment will be added to the pull request conversation.
Under your repository name, click Pull requests.
In the list of pull requests, click the pull request you'd like to review.
On the "Conversation" tab, scroll to the review you'd like to see, then click Dismiss review.
- Type your reason for dismissing the review, then click Dismiss review.