You can reactivate a task that you previously made inactive.
Requirements: You must have a project role that includes the Admin Tasks user right.
You might want to reactivate a task if you accidentally inactivated the task before it was complete or if the reason for inactivating the task has changed—for example, you inactivated a task because the element was removed from a layout, but the element is now back in the layout.
Tip: To view all active tasks, in the Filter list, select All Active.