Did you try with Property view floating or docked? I guess it only appears in floating mode (if I understand correctly the OP).
Property pane looses display behavior after error or message dialog
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Re: Property pane looses display behavior after error or message dialog
I tried it with floating. When I switch to another application, the properties tab falls even behind the FreeCAD window. As soon as I bring FreeCAD to front, the property tab seems to get an event and comes to front above the FreeCAD window.
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