Whether you share documents with someone inside or outside your organization, there may come a time when you no longer need them to access it. With SharePoint, it’s possible to revoke access and remove the user permissions that were granted to a single user or several group members.
Select the file that you want to revoke access to and, on the right-hand side of the selected file, locate “manage access.” Removing others is easy; you just need to tap “X” and they will no longer be able to view, edit or comment on that document.