Be aware that If the store has currently been indexed by Google or almost every other online search engine, it'd choose some time in your changes to look from the search engine results... You may have to be patient! The title of the store alone is set in the course https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html