Microflows extend horizontally, yet it seems only vertical scrolling is enabled in the microflow editor in studio pro.
My mouse has a scroll wheel for horizontal scrolling, it would be nice if it functioned.
Another option (I prefer this one) is that the vertical scroll wheel will allow horizontally scrolling if the microflow does not extend vertically. This functionality is now only available if you use the vertical scroll wheel when your cursor is on the horizontal scrollbar.
I've been notified this already exists with shift + ctrl. Nice!