Woocommerce archive templates are created the same way as normal archives. Note this does not change the shop grid. Want a custom grid? Create a new page and use grid builder and set post type to product to create as you like
But the template need to assigned specifically in Woocommerce archive settings
The post count per page can be set from the setting just below the field.
Want a multi-column layout?
Yes it is possible! Archive builder and Grid Builder contains shortcode field type.
- Create a single item template
- Get the shortcode for that and simply paste in the shortcode to grid builder or archive builder