alt + o > display tab , hide players , hide pets , turn names off , ect are all there you can also in game /hidecorpse all/looted/none , if i remember there used to be command to shut them off but i forget what that one was offhand. spell effects you can turn off in the same display panel turn your particles off for player/enviromen ect turn them off on that same panel . hope that helps
Grim