To manage your 2FA simply navigate towards the right upper corner of your page and click on Account and Sprintax Identity.
Then on the left-hand side you will see a menu, and you must click on Security.
In case you want to disable the 2FA please go back to your account and remove it from Sprintax first from here:
Once you do that you will get message that your MFA is disabled.
Then please go to your Authenticator app and remove the account from it. This way you make sure next time you want to enable 2FA you will be able to do so.