[Zubersoft]

You can manually stop the scrolling in many ways (the quick action box, display the overlay, use a pedal), but it sounds like you just need to crop your last page (if this is a PDF) to remove the white space at the end. This tutorial video covers cropping: https://youtu.be/FA8YV-SL78s

If you aren't currently using the vertical scrolling display mode, I would recommend that. There is a tutorial video here on switching display modes: https://youtu.be/V_8GXnlNfm0

Mike