You can change certain stuff that only you get effected from. There are 3 sections:
Main Options:
You can hear in-game music
You automatically use a skill when you press them
You automatically run when you go forward
If someone dies, you can see blood coming out of them (excluding reseting youself)
You can see what server region you're on
The camera keeps focus on your head
Performance:
You can see your FPS (Frames Per Second)
There are now shadows in-game
Fun Stuff:
Inverts the colors of the game
You screen is upside down
The game is now at nighttime
It rains in-game
The game is only colored in black and white
Your screen is colored pink