When viewing the forum on mobile, it shows the person who started the post. I think it would be more useful to see who most recently posted, at least in the unread posts view. Is there any way to change this?
I think that's something that would be controlled by the theme, actually. I'll look into it.
It is controlled by the theme to some extent. Playing around with the developer options in Firefox, it appears the column with that info is hidden in devices with screen widths of 720px or lower. If you turn your phone to landscape you'll see it.