6 demo BO, even so I couldn't scroll right down to bottom of the side menu to entry the module. It's because by default the menu doesn't scroll, in order to't view the links towards the bottom. There's a no cost module available to make the menu scrollable so that you https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html