You specify the primary URL because the internet search engine may have issue analyzing which a single need to be the primary URL.  The subsequent tutorial will tell you about how you can help Canonical URLs in Prestashop 1.5. This process centralizes administration, simplifies updates, and declutters the HTML https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html