Two questions from one new user

Good morning, i have two questions:
1. I linked my 1password.eu account on an Android device, using the QR code. Under 1password app, i found a Login category, where i find my personal account's data.... user name, password and secret key. How is it possible that my password can be viewed in clear text? Is the password encryption reversible?
2. I have activated 2FA but, when i login from Firefox, for example, i have only to insert my password. No secret key and no 2FA.

Thank you.

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