How do I sell products using several currencies?

The currency is set globally for the whole project in Site Settings → Payment Systems → Currency Format

At this moment, using different currencies on different pages of one project is not possible, unfortunately. To enable the option of purchasing in two currencies, you need to create two separate projects in one account and set a different currency for each project in Site Settings. You can create up to five projects in one account on the Business plan.

Guide on how to set the currency title: https://help-ru.tilda.cc/online-store/cart#rec24395408