can't stop steam from opening big picture mode with controller

[sevensages]

I have the setting turned off to focus steam when the controllers guide button is pressed, and yet since the latest update to steam, steam launches big picture mode as soon as the button is pushed, anyway around this.

[tintingaroo]

Two options are described here:
https://steamcommunity.com/discussions/forum/1/3802778829236587738/#c3802778829237759472