Features to lock documents from multiple viewers

[kineticKIKI]

At my company, when I send out a document to be signed, often it contains sensitive information. We have one login for the entire admin team and as such, all who have said login are able to view all the documents.

Is there an efficient feature to lock certain documents under one business account? For example, specified folders with individual passcodes or any other efficient option available that limit the members of the admin team, who all have access to the login information, to view all documents.