Not sure what do you mean,
To the best of my knowledge, ProtonMail uses end-to-end encryption to protect user data, meaning that only the sender and recipient can read the contents of the messages. ProtonMail itself does not have access to the encryption keys, which means they cannot decrypt your emails.
Granted that it is best to have 2FA for better security and the two-password mode is a plus.
I am curious, What am I missing? Any leaks?