The "Search Engine optimization & URLs" site offers you with a list of these pages and enables you to edit their welcoming URLs and also their meta tags (title, description, search phrase). The default homepage title is the name of The shop, and so the index' title field is empty. https://prestashop-out-of-stock-l24553.national-wiki.com/851508/a_secret_weapon_for_tag_hreflang_automatici_e_tag_canonici_seo