Step 3: Copy the code and paste it under each product item in the collection. https://i.imgur.com/cISZXE6.png
Ex: {{ product.metafields.my_fields.subtitle }}
I appreciate the screenshots that you have added to your post as that is super helpful! Looking into the Debut theme, we may be able to allow our internal themes team to take a closer look at this customization. As the Debut theme is designed and supported by Shopify, we can use free design time for Shopify themes to see if we can make Product title display with two lines with different font sizes.
Since we cannot authenticate you for the store in question over our public forums. I would suggest reaching out to a Support Advisor by logging into your store through our Contact Us page. This will allow us to securely verify you as the store owner before discussing the changes you would like to see on the store.
I’ve done several circuits of Shopify help, but can’t seem to locate where to access a support advisor or the free design time. Can you provide some direction.
Once you successfully login to the store using our Contact Us page, you will directed to the Help Center. You can then type in the search bar what you would like assistance with. Once you hit enter, you should be able to located the Get Support option below the search results.