Reply To: Single Product page template not working
All of the templating and layouts are handled by Elementor. Our plugin just creates modules for displaying individual components for BigCommerce data. It sounds like you may have a configuration issue. Can you make sure your template is published?
For your second question, this is also handled by Elementor. When you create a new template, you can select “Archive” when prompted for the template type. This article should help you get started: https://docs.elementor.com/article/339-creating-an-archive-template-with-elementor-pro