You specify the main URL as the search engine may have problem deciding which one really should be the primary URL.  The subsequent tutorial will provide you with ways to allow Canonical URLs in Prestashop 1.5. Head over to major This Web page retailers different varieties of cookies in https://macrobookmarks.com/story19341208/little-known-facts-about-automatic-hreflang-tags-canonical-tags-all-pages-seo