How to Show All Levels of Preview Shapes
When one shape is nested inside another, such as sub-process, its content (shapes) inside would show along with what’s outside in diagram at the same time. For example, if a sub-process is not composed of any other sub-processes, it will appear in business process diagram, with the shapes (e.g. tasks) that make it up inside itself. However, the viewing works up to one level of nesting only by default.
