As a manager you may want to copy or duplicate an objective. It could be because it's a recurring objective, and instead of extending the date of an existing one, it's usually better to create a new copy and leave the existing objective as-is.
Select Copy this objective.
A new copy of the objective will open in draft mode, ready for you to adjust. As it's a new objective there will be no progress updates or assessment on this one.
Make your changes and save it as draft or confirmed.
The objectives panel will reload showing your changes.