Currency format allows store owner to enable/disable currency code beside price. Cart and checkout prices always show currency codes. Example: $1.00 USD.
From your Shopify admin, go to Online Store->Themes.
Find the theme that you want to edit, and then click Customize.
Click Theme Settings ->Currency format.
Setting
Description
Show currency codes
Cart and checkout prices always show currency codes.
Example: $1.00 USD.