How to Enable Multi-Button Support on a Magic Mouse
The Apple Magic Mouse requires OS X 10.6.2 or later, and the Magic Mouse 2 needs OS X El Capitan (10.11) or later to work correctly with a Mac. Other gesture-based mice may require specific minimum versions of the Mac operating system, so check your mouse’s system requirements.
How to Enable the Second Button on a Mighty Mouse
The Mighty Mouse preceded the Magic Mouse. Apple sold it from 2005 to 2009, then changed the name to Apple Mouse and sold a Bluetooth version until discontinuing the device in 2017.
How to Enable the Secondary Mouse Button Function on a Generic Mouse
Most mice use the drivers built into the Mac operating system. However, if you use a third-party mouse that includes its own Mac mouse drivers or preference pane, follow the instructions provided by the manufacturer. Otherwise, follow these instructions: