1.On the left sidebar of your dashboard, click on the "Reviews" icon
2.Open the "Review Cycle" you want to work on
3.On the Reviewees tab, select the Reviewee and click "Manage Reviewee" to Un submit their Manager Summary
4.Click the three dots beside the Manager and select "Unsubmit Review"
5.Finally, click "Un submit," and the Manager Summary will be removed