Hello, i’m sorry if i missed that option, but sometimes i just don’t know who is who and follow wrong character. (instead of my party member 
)
There is a setting to turn on HP bars i think.
For some reasons sometimes the HP bar of everybody desapears and you must go to settings, and uncheck and check again the option “show other players name” to show again… This ALWAYS happens when you are in a party and a boss battle begins… It’s really annoying , principally if you are a support class like me.