To see which casinos support your preferred currency, choose the currency in the drop down menu and see all casinos listed that support it. Then you can choose casinos supporting whatever currency you prefer. The currency option makes it easier for a better overview of your winnings.
For customer convenience and to make it easier for customers to understand their winnings, casinos usually support a number of currencies. These currencies most often include the big ones like US dollar, Euro, Pound Sterling, Chinese Yuan and japanese Yen. Many casinos also support smaller currencies depending on their focus and presence.