I recognize how important the security of your data, @RSFDenise.

I've got some inputs regarding data security and QuickBooks log in.

QuickBooks Desktop uses a password as an additional layer of security. This way, only authorized users can access your account. Recently, QuickBooks implemented the one Intuit log in to manage your account all in one place effectively. 

For more information, please head to this link: Manage your Intuit Account Online.

Also, yes, there's a documentation about it to ensure we keep your data safe. Please go to this link for additional insights: Why Intuit account for QuickBooks Desktop?

Lastly, you can always manage, view or update your Intuit account anytime. This helps you handle your information better.

You're always welcome to comment back below if you need more account management tips. I'll be here to give a guide or two always.