Use built-in encryption tools like BitLocker on Windows or FileVault on Mac to protect the folder’s drive
Put the folder inside a password-protected ZIP or 7z archive using WinRAR, 7-Zip, or similar software
Use third-party folder lock software that supports password protection and hiding folders
Change folder permissions so only your user account can access it
Store the folder inside an encrypted virtual drive or container
Keep the folder in a cloud service with private sharing and strong account security
Use a separate user account on the laptop with restricted access to the folder
Back up important files before applying any locking or encryption method