I upgraded to MAC OS 10:15:3 Catalina and started having problems with my Expert Mouse being too sluggish to register a click, so that I couldn't select text from the beginning to the end of a sentence. When I upgraded the trackball software, I panicked because it looked like I no longer had options for zoom-scrolling- which is mandatory for us low vision folks. Then I realized that these functions are in the OS under System Preferences>Accessibility>Zoom. Whew! Problem solved. I can assign whatever moderator key I want to activate zoom-scrolling.
