If you want to extend the Templates form theme first you Create a Classy Product Layouts page
After that fill up the page Title ,Content and other fields then Save it
Then Click on Backend Editor
There is no product name in the Product Page
After add Single Product Name in the product page then the product name showing on Product page
Go to ( VCshop >modules > product_layoutbuilder> views >templates >front ) then Copy classy_single_name.tpl file
After that Go to ( VCshop >themes >classic >modules > product_layoutbuilder> views >templates >front ) then Paste the classy_single_name.tpl file here
Before edit the classy_single_name.tpl file
Then you can edit the classy_single_name.tpl file from here
Go to ( VCshop >modules > product_layoutbuilder> views >modules ) then edit the file presta-single-product-name.php
After edit the file then you can show the Product name title has been change
