Ok first off all unbounded scrollig is set to no, so it will never scroll further than the layout-dimensions..
That's actually the reason no scrolling occurs at all at the moment..
Either increase the layout, set unbounded scrolling to yes, or scroll the trees over the layout instead of the other way around..
Secondly, if you have an event that scrolls every tick, like in this example, you probably should remove that if you want to change the scrolling..
the platform on landed event works perfectly if you remove that every tick event..