How to override index.md

I am trying to override content/about/index.md by creating layouts/about/single.html under layouts

about
|
+- baseof.html
`- single.html

I don’t know why it still defaults to _default/single.html, how should I override this?

Difficult to say without posting a link to your repo.

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in content/about/index.md

add this parameter

type: about

this is considering your layout is in layouts/about

Thank you, eman. That solved the problem.