I have created a Layout file with a mix of elevations and plans from a Sketchup Pro 2017 model. It includes a horizontal and vertical section. Evey time I come to export it, print it or render it, it keeps the section annotations, but adds back in the full elevation or plan image. So the front wall is added back in or the roof detail. What am I doing wrong and how can I print and export to PDF retain the cross sections I want to keep.