edit: I think I understand what you were saying... there's currently no forum option to activate that but the Xenforo theme removed the pulldown so maybe a new theme could be created (by the support folks) that has that info visible.There's no option for it in preferences. It could be something written in the theme's code. You can see here, I've switched to the Xenforo style theme and there isn't any dropdown arrow.
View attachment 2218641
.thThreads__message-userExtras {
height: auto !important;
}