Currently when a Board has been created using a Managed Template, any labels within the template will only allow you to add, edit or deactivate existing labels. There is no option to delete a label, even it is not being used on any of the Boards linked to the Template. I was able to deactivate a label to prevent it’s use anywhere, but could not then remove it. This is an issue when a label has been added in error.
This feature request is to enable to the deletion of a label when it is not being used on any linked boards.