The store currency is the currency your customers use to pay for their orders. In Debutify Shopify themes, you can set a store currency that's different from the currency of your bank account.
By enabling the Custom Currencies add-on, customers can choose the currency they want to see product prices, and they pay in the store currency.
After your first sale, the store currency is locked in and can’t be changed, so you need to contact Shopify support, if you want to change your currency.
How to Set a Store Currency
From Shopify admin, click on Settings
Click on Store details.
Scroll to Store currency, click on the drop-down, or contact Shopify support, if you've already made sales.
Select a Currency.
Click Save to apply the changes.