Descriptive Flex Fields - Context Sensitive Segments - How to enable Validator Section

Summary:

Appreciate if someone can help me on this. On my test instance when I go to "Manage Descriptive Flexfields for Documents of Record Attributes>> Manage Contexts", I can see following section in the Create/Edit Context but same is not appearing on production instance.

I need to know, what is controlling "Validators" section visibility on this page.

Content (required):

Following is how it appears on production instance:

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

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