Buttons to get rid of menu objects or insert much more towards the menu. Mark any of your objects currently current after which you can use the arrow buttons about the still left to alter their purchase. So as to add custom links, use the shape at the bottom. Think https://addons.prestashop.com/en/seo-natural-search-engine-optimization/30904-automatic-hreflang-tags-canonical-tags-all-pages-seo.html