2FA is not enabled on your account by default, and you will need to enable it yourself. In order to do that, you must do the following:
Tap on the Account Menu in the lower-right corner of the screen, then tap on the
Settings menu option and choose Two-factor authentication;
After that, tap on Enable and continue the setup flow.
Make sure you save your recovery code in a safe and easily accessible place. You may need it if you lose access to your 2FA codes.
Click on your email address at the top-right corner of the screen to open your Account Menu. Select Settings (at the bottom of the window) followed by Two-factor authentication. Click on Enable and follow the setup flow.