You can only work with the users of a library file to which you have full access rights. When you right click a file of this type in the Library Explorer, you see an Edit option; otherwise, you see a View option.
In a new library file, all users have full access as indicated by the default entry in the Users table. At least one user in the table must have full access before you can downgrade the default Any User rights.
You can add users to a new library file when the file is created, or by right clicking an existing library file
Edit.
New. The New User dialog is displayed. We recommend that you add any users that you want to have Full Access and then downgrade the default Any User to Read Only. For a regime of tighter restrictions, downgrade Any User to No Access, and add Read Only users as required. However, this can prove problematic in practice.
If you do not enter a password the named user will be able to unlock the library file without typing a password.