Thinkific Payments allows you to display your product prices in a buyer’s local currency based on their location and the real-time exchange rates, while you continue to price products in a single base currency. Learn more here: TCommerce: Local Currency at Checkout.
Note that you will still receive payouts in the single currency, the currency of your site. It is not possible to charge and receive payouts in multiple currencies.
Note that if you are using Stripe or PayPal to accept payments, your Thinkific site can only support one currency.