Responsive engine Upgrade broke it for me

Hello Bubble users!

I upgraded the Responsive Engine to [Beta].
After this, a bunch of options is gone and I can’t change the “width” of the page (to 320, 768, etc.)… unless I go to the page properties and change the layout in there, but I need to be able to do it in real time to see, well, responsiveness.

Anyone knows how to fix/roll back to stable Responsive Engine?