When copying and pasting a component that already has a designator in an Altium schematic document and assigning it a new designator, the designator from the original part still shows up as a ghost, as shown in the picture.
How do I get rid of this?
Electrical – How to get rid of faded component designators after copying and pasting components in Altium
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Related Solutions
Here is what I use for this situation (custom part):
There is one part designator (it's one part). I prefer to show the pin numbers.
It's also possible to create a part with sections A, B, C, D, or to have two options for the same type of device (so you can use the most appropriate symbol for a given situation).
To create individual sections, you create a part that looks like a single resistor in the shape of your choice. Then select the part in SCH Library and use Tools->New Part (not New Component) several times and you'll have this:
Then select each section and edit the symbol and pins to agree with the physical part. More in this tutorial.
The default designator for the above situation is R?A. to R?D, as you said you want, but you may prefer to alter that if you are doing multiple channel design.
I reckon it's an error mark. Try T-M enter to Reset Error Markers
Best Answer
In 'old' Altium (17 and older): Do a recompile.
In 'new' Altium (upto 21): DXP Preferences -> Schematic -> Compiler then in the 'Compiled Names Expansion' section uncheck 'Designators' then press the Apply button at the bottom. Then re-check 'Designators' and push Apply again.
... and all the ghost designators just got busted.