How do I un-approve a milestone?
When reviewing the milestones and tasks, you might accidentally approve a milestone. If this happens, you can easily unapprove it by selecting the milestone you wish to unapprove and click the Unapprove Milestone button on the top right of the middle section.
After the milestone is unapproved, the milestone and tasks will go back to in review and the unapproval will show as an event in the Milestone Feed.