How to search for legal name when using preferred name in display name person format?

Summary:

We would like to use preferred name on our directory and search, but we have noticed that we cannot search on the legal name in the payroll tasks as it uses display name. This makes it difficult for the payroll group to enter child support orders, etc.

Content (required):

Need to be able to search on legal name when using preferred name in the display name.

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