The module automatically adds a default canonical url to all of your item, group, CMS pages only. By default, the module utilizes The present url on the web site as being the default canonical url. Be sure your XML sitemap only incorporates canonical pages. This allows engines like google find https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html