For the system to show the currency correctly, you must set the transactions currency.
To make this you must access to your Ordering Builder and change the currency of the Ordering Web/App
Save the change and make the rebuild to apply the changes.
To change the currency shown in the applications you must access to your Ordering Editor to put the currency text that you want, here you can put symbols like $ €
Have a nice ordering
Regards, Marcos Beltran