Thanks for your answer.
But, as I understand correctly, user search in ACF is provided by Select2 and not by get_users()
I’ve recorded video of this issue.
Search by name is not working in 5.2.7 version, but it does in 5.2.1: https://youtu.be/G1jrSyOe-5s
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users