You specify the main URL since the internet search engine can have trouble pinpointing which one particular should be the primary URL.  The following tutorial will teach you how to permit Canonical URLs in Prestashop 1.five. By default, PrestaShop's deep URLs (which is, distinct pages instead of on the https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html