Notice that If the shop has previously been indexed by Google or any other search engine, it might consider some time for the adjustments to appear during the search engine results... You may have to be patient!   You specify the principal URL as the online search engine might have https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html