Depending on where you want to unapply a template, there are two ways:
To unapply a template on a single element:
Open the element’s Layout view.
Change the Editing Channel to Element Drawing Template.
Click Clear. The drawing reverts to the default automatic layout.
The best way to unapply a template to a class of elements is to delete the template. When the template is deleted, all elements of that class revert to the default automatic layout.
Class templates are saved in Administration > Graphics > Templates> _class with the same name as the class they are applied to.
For information on deleting templates, see Section 7.4.3, Deleting a Template.