I did the mosaic with 3 columns. I was not into the columns scrolling separately. Then @williamtisdale gave me a good tip on how to unify the scrolling elements.
But, my groups are all displaying at slightly different heights, so when I try to scroll things get ugly.
I tried to resolve it with conditionals and make the elements respond to each other, but that doesn’t work. And workflows don’t let me adjust the size of the elements.
Any suggestions are appreciated.