You can hide files on Windows 11 without any software using File Explorer by selecting the file/folder, going to Properties, and checking the Hidden option.
To view hidden files, enable the Show Hidden Items option in File Explorer.
To unhide files/folders, navigate to the hidden item's Properties, uncheck the Hidden option, and apply the changes.
Alternatively, you can hide files on Windows 11 using Command Prompt by executing specific commands to hide and unhide files.