How to hide files or folders from the Files iOS app?

Stoyamix wrote:

Would like to hide a file on my files app on iOS is this possible?

If you have access to a network server, place your “secret” files there. Using this approach, you’re not so much hiding those files, as placing them somewhere else requiring extra steps to access. macOS and Windows can both run file sharing services, as can NAS devices. The file server would need be available on the same network.

There are “secret” storage apps around as well, though I would be somewhat cautious about those as some of the app vendors have disappeared leaving their users in trouble. This does not use the Files app.

No, except by deleting the Files app. As iPhones are personal devices, no one should be seeing the contents of your Files app but you.