Also see: Require master password for selected vault items
https://protonmail.uservoice.com/forums/953584-proton-pass-authenticator/suggestions/47581775-require-master-password-for-selected-vault-items

As a Visionary user, my Proton account is protected by many assets. I set a very strong password to protect my Proton account, and I cannot remember it (that is why I need a password manager). It would be a nightmare if I had to enter my main password to access an item. Extra Password for Selected Items feature would allow me to use a simpler password to add more protection for the item.