Pleasant URLs are being set from the configuration page of each and every product, group, or static articles web page. This development page is just practical for some automated internet pages, and most of the time you won't have to worry about these.   You specify the main URL since https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html