Thanks Laszlo, that sorted it.
Although I have to ask why did Graphisoft change the behaviour of the
Categories and Properties label to always display the ID while the
Identification and Property label gives you the choice?
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics