Zbrush 2020 Interface
Did you solve this problem?
I’m also an iMac user and I think ZBrush is not using AnitiAliasing in mac.
But, if you increase the resolution of the iMac and increase the ui size of ZBrush at the same time, you will see better results.
It’s ridiculous anyway to make iMac’s resolution to 5k for better font result.