Windows: Right-click the folder, select Properties, go to the Security tab, and set permissions
Windows: Use a ZIP tool with password protection to encrypt the folder contents
Windows: Use BitLocker to encrypt the drive containing the folder
Windows: Use third-party folder-lock software to set a password on the folder
macOS: Use Disk Utility to create an encrypted disk image for the folder
macOS: Use FileVault to encrypt the Mac and protect access to folders
Linux: Use file permissions with chmod and chown to restrict folder access
Linux: Use an encrypted container or archive with a password to protect the folder
Android: Use a file manager or vault app that supports password-protected folders
iPhone: Use the Files app with encrypted storage options or a secure vault app
For sensitive data, use encryption instead of only hiding or restricting the folder
Keep the password strong and store it securely