You specify the principal URL because the online search engine could have problem pinpointing which one must be the principal URL.  The next tutorial will show you ways to allow Canonical URLs in Prestashop one.five. Improve the indexing of one's Prestashop urls in Google. This module AUTOMATICALLY adds, without https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html