Observe that In the event your shop has already been indexed by Google or almost every other search engine, it might get a while to your improvements to seem from the search results... You could have to be patient! Most of the time, we propose not to the touch these https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html