The module automatically adds a default canonical url to all your product, class, CMS pages only. By default, the module utilizes The present url on the site given that the default canonical url. Including this code to every website page of your web site is probably inconvenient and impractical, but https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html