If you wish to use Wise, your US bank will pay the money to Wise who will then convert and send the money to your Portuguese bank account,. That's how they operate, that's how all money brokers work.
If you wish to go directly from bank account to bank account, bypassing any intermediaries, you will need to arrange a SWIFT payment through both banks. Find the IBAN of your Portuguese account and then ask your US bank to use SWIFT messaging to credit your Portuguese account.