The currency information is shown based on your Shopify currency settings. Here's how to check it out:
Go to the Shopify admin -> Settings -> General page: https://shopify.com/admin/settings/general
Scroll down to the "Store currency" section and change the currency in that section.
Note: You might be prompted to contact customer support to change it because, after your first sale, the currency is locked in.
Once the currency has been changed on your Shopify admin, the app will pull out that information automatically after a few hours or immediately after refreshing the store details.
Change the currency Formatting
Our OrderlyEmails app uses the 'Email with currency' and 'Email without currency' fields to display the currency and its formatting:
Note: If these fields are modified, the changes will be reflected automatically for any order generated, old or new. In case the changes aren't reflected on your templates yet, please consider refreshing the store details.
For more details about the available Shopify currency formatting, you may refer to this Shopify help article: https://help.shopify.com/en/manual/payments/currency-formatting