If you want to set a personalized canonical URL for a certain products, group, CMS, company or provider page, then Visit the configuration of the website page, choose the option "Tailor made URL" and write the personalized canonical url within your choice. Canonical URLs are used to stop replicate content https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html