Hey everyone, quick announcement!
You can now allow your groups to scroll when content overflows with a new checkbox available on container elements. Your container will have to be either fixed height or have content taller than the max height for the content to actually scroll.
Note: the container itself will not scroll in edit mode and the content will appear to be cutoff. To design the content that will appear “below the fold,” set a larger than needed max height in edit mode, then readjust to the right max height when you are happy with how it looks.