Multi-Currency requires you to set a default currency for the app to understand what currency your site normally sells in.
Note: Your default currency in the app should match your store's currency.
To change the default currency in Multi-Currency, follow these steps:
- From Shopify's admin, select Apps.
- Select Multi-Currency.
- Under "Currencies", select the Gear Icon next to the currency you would like to make your default.
- Select Set as the default currency.