Color coded names

we are using RT 3.8.7 and one user was saying he can see (inside any queue) his username (when he is an owner) and email address (when he is a requester) in green and all the other names in black, while when I look at the same page I see all owners and requesters in black including myself. how was he able to change his settings to see himself in green? I looked at Preferences but I am not able to find any color coding settings.