Most mice have two main buttons: the primary button and the secondary button. The main button is usually on the left side of the mouse, but some users prefer to swap them if they are left-handed or have different preferences. Here’s how to do it on your Mac.
First, open System Preferences by clicking on the Apple logo in the menu bar then selecting “System Preferences.”
In System Preferences, look for “Mouse” and click. This will open mouse options.
In the Mouse options, look for the “Main Mouse Button” section, then select Left or Right depending on your personal preferences. The default primary mouse button is Left, but some right-handed users use the Right button as a primary.
The secondary button is usually used for what many people call “right clicking,” which is another way to bring up contextual menus or other options with the mouse.
Now you can close System Preferences, and your options will be saved. You can always change it back at any time by visiting System Preferences> Mouse again. Happy clicking!