You can undo all model changes made due to the assignment of templates, for example, you can restore the default for objects of Function type.
Procedure
In the model, right-click an object of Function type.
Click Select > All of this type.
Activate the Format tab bar.
Click the Template box. The available templates are listed.
If necessary, use the scroll bar to display the Reset template.
Click the Reset template.
All selected objects are reset to the default without prompting for confirmation.