Thanks for the reply.
I seemed to have tried all ways, including your suggestion of "searching" for parts named 4011. All I find are my previous attempts at editing a 74xxx chip which happens to be a 14DIL and, since they are rubbish because I couldn't fully edit the schematic and change internal gate diagrams to suit, I tried to delete them. No right-clicking option to do that either.
No multipart items as you describe are to be found.
When editing an existing part, the schematic allows no alteration whatsoever, just metadata.
Clearly, I am not on the same page here. Sorry for being a dumbo but something is "getting lost in my translation".
FYI. In order to try to remove the baddies, I uninstalled Fritzing, searched and deleted any related files found on the hard drive, reinstalled Fritzing and, you guessed it, the baddies remain.
Time for a whisky, I think.