Two-factor authentication (2FA) provides an additional layer of security by requiring a code to complete a login. Access the settings by hovering over the user icon in the top right of the screen and clicking "Two-Factor Authentication" in the dropdown that appears.
You can enable 2FA for your account by scanning the QR code in to your favourite application (a list is provided on the page for each OS). Enter the code that is given when you have set-up the account in your decide and click 'Verify & Enable'. If valid, the 2FA Enabled toggle will now be green.
If 2FA is forced for operators and you do not have 2FA enabled currently, you will see a screen to set it up on your next login attempt.
2FA can be disabled by entering a valid code and clicking the 'Verify & Disable' button.
If 2FA is forced for operators, then it will not be possible to disable it yourself. Only another operator can disable it in your operator profile, and then you would need to set it up again on next login.