You specify the main URL because the search engine could possibly have trouble pinpointing which 1 need to be the main URL.  The next tutorial will teach you how you can help Canonical URLs in Prestashop 1.5. Enhance the indexing of the Prestashop urls in Google. This module AUTOMATICALLY https://zbookmarkhub.com/story19333197/hreflang-canonical-no-further-a-mystery