Notice that If the store has already been indexed by Google or any other search engine, it would consider some time for your adjustments to seem inside the search results... you might have to Wait and see! Usually, we propose not to touch these fields without the need of understanding https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html