Question string is eliminated only when essential, pagination is retained and taken care of (an existing "prev/up coming" system is necessary, more recent PS already does it) The default homepage title is the identify of The shop, and therefore the index' title field is vacant. If you place information in https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html