The module automatically adds a default canonical url to all your item, class, CMS pages only. By default, the module works by using The present url in the webpage as the default canonical url. Yandex: Russia’s most popular online search engine also supports hreflang tags. It works by using them https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html