Greeks Scale settings allow you to set the price scale, time scale, and time direction and to choose percent or fractions for implied volatility and delta and gamma.
Price Scale
Select Decimal, Normalized, Currency, or Tick Units.
Time Scale
The time scale applies to theta values. Select Days or Years. Years multiplies the daily theta value by 365.
Implied Volatility
Select Percents or Fraction.
Time direction
The time direction applies to theta values. Select Direct time or Time left to expiration. If Direct Time is selected, negative theta values are reported rather than positive.
Delta and Gamma
Select Percents or Fraction.