I'm encountering an issue where, when I tick the "Do not display username change publicly (if changed)" option, it keeps untoggling and isn't saving. I don't want the previous usernames icon to show on users!
When viewing a member card or Profile page it is normal to see this icon which can be clicked to see previous usernames.
This icon is visible even when "Do not display username change publicly (if changed)" is checked. The confusing part is that only the member looking at his own member card or Profile page will see the icon next to their username. In addition Administrators and Moderators will see this icon, only normal users will not see the icon.