Username not searchable

Despite the settings, username is not searchable on CB Userlist. I even went as far as going to the CB Menu item and change from "Show List" to "Show list and search" but still isn't working.

Under CB Field Management, everything is green across the board. I checked out the video search tutorial but that wasn't much help when it comes to username searching.

Edit your username field within CB > Field Management and mark it searchable. Next note what tab it's on. Now navigate to CB > Tab Management and ensure the tab it's on is accessible to the viewing user that's trying to search (e.g. public and published). Next edit your userlist and ensure it's in one of the columns otherwise set your userlist to search all fields under Parameters > Search.