About the configuration of the page, you only want to pick the option "Customized URL" and publish the customized canonical URL you desire, you can established a unique URL for each language of the store (multilingual store) Rel=canonical need to only seem within the of the document. A canonical tag https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html