1. Create a PCB layout from a schematic 2. Add a copper area (GND, say) 3. Set "Copper Zone" to Invisible 3. For a few components, set PrefixDisplay to False. 4. Save the PCB 5. Close PCB 6. Reload PCB -> The PrefixDisplay is still set to False for your components 7. Set "Copper Zone" to visible 8. Save PCB 9. Close PCB 10. Load PCB -> Verify that the components whose PrefixDisplay had been set to False are now "True" Note that it is necessary to toggle the copper zone to trigger the behavior. There may be other triggers, but this one is replicable 100% of the time.