Over the configuration of the page, you just will need to choose the option "Custom URL" and write the customized canonical URL you would like, it is possible to established a different URL for each language of your store (multilingual shop) You will discover 3 ways to include hreflang tags https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html