This page sits under the Guides group in the sidebar. Its front matter is nothing special:

---
title: Example page
permalink: /docs/guides/example-page/
excerpt: "A minimal example of a page nested under a sidebar group."
---

The nesting is not declared here — it comes from _data/navigation.yml, where this page is listed as a child of the Guides group:

  - title: "Guides"
    children:
      - title: "Overview"
        url: /docs/guides/
      - title: "Example page"
        url: /docs/guides/example-page/

That means a page’s position in the sidebar is independent of where its file lives on disk. The docs/guides/ folder is a convention for keeping related files together, not something the theme reads.