Why are only contours shown for some objects?

When you open models, only contours are shown for some objects because of the following:

Rather than removing the excluded objects entirely, ARIS displays only their contours so that the overall layout of the models is not damaged.

Also, the assignment icon is not displayed for non-configured objects with models assigned.

Objects that you disabled using the properties dialog behave differently. They are not colored, either, but their names, placed attributes, assignment icons, etc. are displayed.