No more "Define Layout" in controller settings since last Steam Update

[SENTIONAUT]

Since the latest Steam Update, there is no "Define Layout" button in the controller settings anymore. And this resulted in Big Picture Mode popping up again, when I hit the Guide button on my Controller...
Before the update, I could go into "define layout" and remove the big picture mode from the Guide button binding.

So my question is:
Why have they removed the option for us, to define custom layouts?
I need this, because I frikking hate that BPM popping up again...

If you don't understand what I mean, look here:
https://www.youtube.com/watch?v=tlj1MQ3NSV8

This was my solution to the big picture mode before the update.