By going to the Overview section of the Helix Fi app on your phone.
It’s not recommended that you deactivate the Advanced Security, as you will lose the protection on all your devices and stop receiving notifications of detected threats. Nonetheless, here is how you deactivate it:
Access the Account section of the Helix Fi app via the icon in the upper left corner of the Overview tab screen and scroll down to the More Options heading.
Select Helix Fi Advanced Security, select Deactivate or Activate and follow the instructions.