Am I correct to assume /vendor/ is always the fallback from app?

If that is true, could I install my theme to:


Does theme registration or another issue prevent theme installation here?

DevDocs states Magento themes can be installed under /vendor/, "when a Magento instance is deployed from the Composer repository."

What about custom themes not installed via composer?

1 Answer 1


You can place you theme in any folder. Only one requirement is register it in \Magento\Framework\Component\ComponentRegistrar

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