About hidden passwords for items within shared folders
When you share an item, regardless of whether you enable the "Allow Recipient to View Password" option, you should be aware of the following:
Savvy end users could potentially access the password if they capture it using advanced techniques, but LastPass will never be able to access this data because it has been encrypted using their public key.
It is also possible to obtain shared passwords using another password manager.
For these reasons, LastPass recommends that you generate a secure password specific to the Site that you’re sharing in order to avoid sharing any passwords that you’re uncomfortable with the recipient obtaining.