how do you search in all documents inside a high level folder in the left contents? The ancestor technique doesn't work for me.
If I understand correctly, folder = the 'container' unit in the left navigation tree under which you nest a bunch of pages (and other items).
There's a page tree search macro but since Folders are not pages, they have no content on their own so you can't use that approach.
If you insert that macro onto a page and don't specify the root page, the search will be conducted just within the hierarchy of that page that carries the page tree search macro.
Workarounds:
Personal note: I'm not a fan of folders precisely because they have no content. A page serves the same purpose (of a container) and even by dropping a child pages macro there you provide readers with context and expectations.
@ian_mcgregor I am not sure what you mean by high level folder. Confluence is not structured by folders. Here is are a couple of KBs about Confluence search:
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