How do I see DFF's in HCM Experience Design Studio?

Summary:

I created a new DFF on the PER_ASG table and wanted to add it to several transactions in the HCM DS. I am not seeing this DFF as an option when I'm creating the rule.

Content (please ensure you mask any confidential information):

Is there process that I need to run to pull the DFF into the HCM DS?

Version (include the version you are using, if applicable):

R13/NUX/23D

Code Snippet (add any code snippets that support your topic, if applicable):