Simply scroll left to right to cover various sections of your layout that you are actively controlling. By modeling sections of your layout, your level of detail will be greater, and easier to operate.
I've not played around with the app to find the scroll function. Pointer, please. I have played with the app a bit since my last posting and really haven't figured out how to enter other than a fairly small segment. Unless the segments are somehow joined, I think there might be a problem in controlling more than a single consist at a time.
Would the developers consider adding a pinch function to expand and contract the layout diagram?
I plan to give Matt Jackson (thanks for that contact) after I've had the opportunity to play with the app a bit more.