You specify the principal URL since the search engine may have difficulty identifying which 1 need to be the key URL.  The subsequent tutorial will explain to you ways to help Canonical URLs in Prestashop 1.five. Enhance the indexing of the Prestashop urls in Google. This module AUTOMATICALLY adds, https://top10bookmark.com/story19075596/not-known-details-about-automatic-hreflang-tags-canonical-tags-all-pages-seo