Haha, wrong settings girl! I mean, inside the game, there is a little red button named 'settings' close to where you pick songs..
To mask the opponents arrows, look on the bottom of that settings menu and select
Mask
Arrows / Full.
If you only mask arrows, you can still see my health bar and combo (that way you will know how good I am and wether I am dead or not)
If you mask FULL, half your screen become black and you don't know anything about me at all before the game is over. I recommend you mask only arrows...
<3