Customize protected branches allow to push dropdown list

Hi. Our company wants to disable the ability to switch the “Allow to push” parameter for “master” protected branch from “no one” to any other. How can I trim the dropdown menu and leave only 1 item “no one” here?
Something like that:
Befor:
%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%D0%BE%D1%82%202019-02-07%2016-35-08
After:
%D0%A1%D0%BD%D0%B8%D0%BC%D0%BE%D0%BA%20%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%D0%BE%D1%82%202019-02-07%2016-38-08