To change the currency you’ll need to change this in the product price bindings (the product regular price and product sale price layer).
Once you select one of these layers, you can navigate to the data tab and edit the
component.options.text binding by selecting the
<> icon. You can change the currency on the 5th line where it shows
After you’ve changed the currency, you can save the product box as a template so you don’t have to change the binding every time you add a product box to a page.