When creating Constituent lists in RE NXT, users may notice that their Custom Fields are missing. The Attributes appear on Constituent Records and are available for use in the Database view. The Custom Fields (also known as Attributes in the Database view) are available and active in Configuration > Attributes.
If you are experiencing this issue, chat with Support and reference this article.
Steps to Duplicate
Log into RE NXT
Select Lists > Constituent
Select Filters > Custom fields > Filter by Category