Sometimes multiple items in NaturalHR are archived by mistake. in order to restore these items to active simply navigate to the applicable module, for example Time and attendance -> Time Off.
You should then see the Archived button, clicking this will allow you to view all archived time off instances:
You can then select those you want to unarchive (using the tick box):
At the bottom of the screen you should see a 'bulk actions' button. you can now click on the button and then select 'return', this will restore the records to active.