In additon to elisolution's answer earlier mentioned, this also checks whether we are actually on the home web site (not only whether or not the canonical was set or not). I tested this Option somewhat and so far as I'm able to see, it really works as expected. Usually, make sure https://addons.prestashop.com/de/seo-suchmaschinenranking-optimization/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html