How to sort a repeating group based on radio buttons?

I see I can sort by ‘Change which field…’ but I can’t figure out what that means.

Simply, I want the user to choose the sort field via radio buttons. Can I do this?

Thanks!

Okay, I figured it out:

  1. Make sure the radio button options exactly match the field names.
  2. Use ‘Change which field…’ and put the radio button input in the ‘Dynamic field name’ box:

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