The module automatically adds a default canonical url to all your item, classification, CMS pages only. By default, the module uses The existing url of the web site because the default canonical url. 2nd, If the articles is available via a number of URLs, other sites could link to distinct https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html