커스텀 필드(IF)에 값이 있는 멤버를 필터링하는 방법은? (예: LinkedIn 링크가 있는 모든 사용자)

If the custom field is searchable (set in the custom field settings) then you can search for it, including on the user directory page.

Or you can create a data explorer query to pull a list out, if you have the plugin installed.