If the reference for a sketch relation or dimension is missing, you can display a ghost image of that missing reference by hovering over or selecting the dangling relation or dimension.
The ghost image has the same size, shape, location, and orientation as the original entity.
The ghost image appears whenever you select a relation or dimension to that reference (for example, if you start the Display/Delete Relations or sketch entity PropertyManager).
To display a ghost image of a missing sketch entity: