How to enable nested links without displaying it in the sidebar?

[KadoBOT]

I was trying to find how to achieve this in the repo code, but I couldn't. I have a folder, with some nested pages. And I want to be able to navigate between them using the navigation links, without displaying it in the sidebar.
But if I don't add them in the startlight sidebar, the generated button will move to the next item in the sidebar, instead of a sibling document or something.