I just moved to mac recently but had been using zbrush for a while.
I am very used to the “+” “-” shortcut for zooming in and out, however I only been able to zoom out with “-” but nothing happens with “+”
On a side note i had similar problem with brush size control “[” “]” only been able to make the brush smaller and not the other way. But I did found the solution for that but not with zooming in.
Current setup is iMac 27 2019 running Catalina