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I have tried to make an arc by converting a path into a PCell chosen from Basic Library.
I got what shown in the following picture. But I wanted to have a real arc, not a square with a text saying it is an arc.
Wondering whether this is just the hierarchy display
being set to "top level only", while a PCell's detail
may be one level down?
Display > Full Hierarchy ?
Display Full Hierarchy solved the problem.
Display Full Hierarchy
Another potential pitfall it not to assign a valid layer. The basic library shapes need a target layer which by default is empty. Hence nothing will be generated.