Your preferred currency can now be set as a global feature to collect payments. In the Global settings left menu, E-Commerce settings have been enhanced to include this option. This means that creating courses, tests, live classes, and products no longer requires selecting a preferred currency.
You can set the preferred currency in the dropdown currency option based on the payment gateway selected. As an example, when you select PayPal, all currencies supported by PayPal payment gateway are listed under 'currency'.
Check this KB Article for more info.