There's no enabling, as there's no UI yet, and Debut doesn't have the new sections built in. Our own internal team theme devs are just starting to build with the new paradigm, just as partners are. You should be able to create new directories in your theme that follow the the new theme paradigm, along with new liquid files for the different page types (products, collections, custom pages, and blog). You will be able to test the output on your storefront of the new code but not the new online store design experience (ui) . https://help.shopify.com/en/themes/development/section-themes Good luck and happy coding!
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