The module automatically provides a default canonical url to your item, classification, CMS pages only. By default, the module takes advantage of The existing url with the site given that the default canonical url. Introducing this code to each website page of your web site is probably inconvenient and impractical, https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-google-rich-snippets-json-ld-opengraph-twitter-tags-schemaorg.html