Search Help attached to Data Element Question

Hello! Hopefully this is a simple question to answer. I have looked online but cannot find exactly what I need.

We currently have a search help attached to a data element. The search help is a custom search help. It does work so when you are in the screen it will show you options to pick from for that field. However, the field also allows for free-form text so the user can type in whatever and the screen will take it.

Is there a way through the data element or search help to make it so the user is restricted to only what is in the search help and cannot just enter whatever?

Thanks!!