Google Labels and DLP Rules based on selected label. How does it work?

So I've gone and created a label for my orgs Data Classifications. Any file in Drive can now be classified under any of the 4 options, or a 5th for not yet being classified.

I am now trying to leverage these labels for DLP rules such as, "Any doc classified as Confidential cannot be shared outside of the domain"

The problem I'm encountering is that I can't seem to select this condition how I assumed I'd be able to.

I go to create a rule, and when I get to the Conditions page, I can add a condition of: Classification label is Classification label", but I cannot adjust the operators.

See the screenshot for details

How am I supposed to be able to use a documents label for the basis of DLP?