You specify the principal URL as the search engine might have issue deciding which 1 really should be the primary URL.  The subsequent tutorial will show you tips on how to enable Canonical URLs in Prestashop one.5. Improve the indexing of your Prestashop urls in Google. This module AUTOMATICALLY https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html