You specify the primary URL since the online search engine might have difficulty deciding which 1 really should be the first URL.  The following tutorial will demonstrate ways to allow Canonical URLs in Prestashop 1.5. The default homepage title may be the name of The shop, and as a https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html