I'm not sure when my display changed but I can hardly see the headers on the board columns but other users still see it clearly. For this reason I'm assuming its a setting specifically associated to my acct/login.
I've attached 2 screen prints my display, issue.jpg) with yellow highlights where other users see them and the other (capture.jog) with a different users screen prints and how I want mine to look. As of yet I haven't found anyone else on my team who's screen appears the way mine does.