Help-About.
The 7.6 version that contains the fix is not released yet.
Aha, I understand 
@wim Iâd like an explanation why itâs not possible to delete layers via the keyboard under mac, too. Itâs probably one of the most annoying âfixesâ ever done in my opinion.
One day on the mac version of Rhino and I am already maximally annoyed by âfeaturesâ that are just incomprehensibly different from the windows version for nobody-knows-whatsoever-reason. But I digress, sorryâŚ