You specify the first URL because the search engine could have problems analyzing which a single needs to be the principal URL.  The following tutorial will provide you with how to permit Canonical URLs in Prestashop 1.five. The sitemap also allows you to change any characteristics, which includes hreflang. https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html