Fundamentals > User Interface Basics > Customizing the User Interface > Entity Display > To Show Reference Designators
  
To Show Reference Designators
To make each assembly component designated as a connector in Cabling or imported as an ECAD component appear with its reference designator in 3D assembly views, do the following steps.
1. Click File > Options > Entity Display.
2. Under Dimensions, annotations, notes and reference designators display settings, select Show reference designators of cabling, ECAD and piping components.