No way to do this in muse. I watched it today, too. Needs some coding.
I saw a widget that allows you to do this. It seems to be from QooQee called "Slider page." But how to use it, I can not imagine
At least one person has to do the coding. In this case qooqee did it. But the transition is not only sideways but this "rolling" as well, right? But let me add, even on the example pages it takes longlong time before one can see anything – quite unpredictable.
BTW, the sideways transition could be done with scroll motion as well. Not as smooth maybe and not exactly frame by frame, though.
I looked at the tutorial that they published on their website. It seems that this is all done very easily. It's not entirely clear how, but they do it in the video very easily.
Smoothness is a key factor in the comfortable movement of the site. thank you