The module automatically adds a default canonical url to all your products, classification, CMS pages only. By default, the module utilizes the current url of the site since the default canonical url. Canonical tags are not the sole technique to declare a webpage’s canonical. You should use three other procedures: https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html