The ATM (at the money) Settings allow you to choose how many strikes to display in our out of the money.
Tip: If you select too many strikes in or out of the money, you may skew your implied volatility or greeks because the further out you go, many strikes may not be trading. If you choose too few, you will only be including those in the options calculations.
You also select whether you want your calls and puts displayed above and below the at the money strike or if you want calls and puts displayed side by side.
