Hovering over someone’s shoulder tells them exactly what you think of them.

Standing behind a person while they work turns help into supervision. Whatever you say out loud, the posture tells them the task is not safe in their hands, and they begin performing for you instead of thinking about the job. Most hovering comes from your own worry about the outcome rather than from anything they have actually done.

Hand over the task, say when you will check in, and then physically leave the area. If one specific mistake concerns you, name it up front instead of waiting to catch it. People do better work the moment they stop being watched for errors.