Go to Administer menu » Customize Data and Screens » Entity Templates.
You will see a list of templates, filtered by the entity type at the top of the screen. Press Edit to view/edit the template and Delete to remove it permanently.
Once you've created at least one template for an entity, you should see a dropdown to select the template when creating a new entity of that type. See the screenshot below as an example. Selecting a template will reload the page with the appropriate selections from your template.