I appreciate you're trying to help the OP but this article literally describes their issue with the MacOS notes app.
I did the ole Gemini search and daddy AI came back with this if it helps you OP:
While macOS doesn't have a built-in feature to lock individual apps with Touch ID in the same way that iOS 18 allows for locking apps with Face ID, there are third-party solutions that provide this functionality. Here's a breakdown:
- Third-party apps:
- Apps like "AppLocker" are designed to password-protect individual applications on macOS. These apps often include support for Touch ID, allowing you to unlock protected apps with your fingerprint.
- These applications add an extra layer of security to your mac, and can be very useful in situations where you want to keep certain applications private.
- macOS built in security:
- macOS does have strong security features, like requiring a password or Touch ID to log in to your user account, and file vault for encrypting your drive. But this does not extend to individual application locking.
Therefore, while a direct, native feature like iOS 18's app locking isn't standard on macOS, you can achieve similar results using third-party applications that support Touch ID.