To change root location on Product Breadcrumbs.
#1. You can click on Gear icon
#2. Click Advanced > Page Header Code Injection
#3. Paste this code. Replace Google with new url.
<script>
document.addEventListener('DOMContentLoaded', function() {
var links = document.querySelectorAll('a.ProductItem-nav-breadcrumb-link:first-child');
links.forEach(function(link) {
link.href = 'https://www.google.com';
});
});
</script>
