Hi, when you are making Bank Transfer, you are able to select from which wallet would you like to send money.
When you add to :r: Bank accounts for transfer, you chose this account currency.
It is possible to transfer USD from :r:, I checked with USD->PL IBAN in USD.
If you are trying to transfer USD from Revolut US account to another US bank account, you can complete by domestic transfer. I make this transfer regularly. The funds are credited to my US bank account in the next day. All you require is your bank account and routing number.