Search miniOrange 2-Factor plugin tab and Click on Login Settings tab.
There are Two options:
Login with Password + 2nd Factor:
You can log in with WordPress username + password, and then 2nd-factor authentication.
Login with 2nd Factor only:
In this second option you get variations of Username + Password and Username + 2-Factor Authentication in the same window. Click on See Preview for more information of Combined window.
Select Login with 2nd Factor only for passwordless login and click on Save Settings.