Bento 3-Unable to lock/encrypt fields

I am using Bento 3 but have been unable to lock/encrypt fields.

I have already created a password to lock the Database. I am able to lock the database but when I view what's listed as an encrypted field I have an option to lock Bento but there is no option to lock the encrypted field. The lock icon is missing.
I have looked at the instructions but don't see what I'm doing wrong. Any idea of why I'm not getting this option? Thank you.

Thank you for your response. I get the down arrow but all it says is:
Show Encrypted Field Comments
Lock Bento
Copy Field Contacts to Clipboard

It doesn't show the option to encrypt the field.
Also, if I'm correct there should be 3 choices for the eye, an open eye, a closed eye, and a lock. I don't get the lock.

I tried creating a new one but it didn't solve the problem.
I had Bento 2 and upgraded to Bento 3 which I know added this option. I don't know if maybe there could be a bug or either something wrong with the install but I even did a google search and it doesn't seem like other people are having this issue.

When I went back and deleted all the encrypted fields from the database and cleared the database password to start everything over, it then lists 'lock encrypted fields' as an option.
Then I chose new library from template and chose user name and passwords. It shows lock encrypted fields in the password field.
The question then becomes: Under security I am not requiring database password when Bento starts. Is it possible to require database password when Bento starts and lock encrypted fields at the same time?