@virginie
The default schema code for Shopify can be found in the theme.liquid file, which is located in the "Layout" folder of your Shopify theme.
To find the theme.liquid file, you can follow these steps:
Once you have opened the theme.liquid file, you can search for the default schema code. The schema code is typically located within the <head> section of the file and is used to define structured data for search engines to understand the content of your website.