How to Set Up a Left-Handed Mouse on Mac

Move your mouse to the left side of the keyboard and everything works — except that your index finger now sits on what macOS thinks is the right-click button. One setting swaps the buttons, and a matching option mirrors the trackpad's corner click. Both take under a minute on macOS 13, 14, and 15.

Swap the primary mouse button

1. Connect the mouse, then open System Settings → Mouse.
2. Find Primary mouse button and select Right.

That's the whole swap for a standard two-button mouse. With the mouse in your left hand, your index finger rests on the right-side button — now the primary click — and the left-side button becomes secondary click (the context menu). The change applies instantly, to every app.

One heads-up for shared machines: this is a per-user setting. Your account keeps the left-handed layout while another login on the same Mac stays right-handed — nobody has to compromise, but it also means a new user account starts back at the default.

On a Magic Mouse

Apple's Magic Mouse has no physical buttons — its whole top surface is one clicker, and macOS decides which side you pressed. So the setting reads differently:

1. Open System Settings → Mouse.
2. Set Secondary click to Click Left Side.

Now a press on the right side (under your left index finger) is a normal click, and the left side brings up context menus — a perfect mirror of the right-handed default. Everything else about the mouse (scrolling, swipes, smart zoom) is symmetric and needs no change.

Mirror the trackpad to match

If you use a MacBook trackpad or Magic Trackpad alongside the mouse, its secondary click can mirror too. This only matters if you use the corner click style — the default two-finger click is hand-neutral.

1. Open System Settings → Trackpad and stay on the Point & Click tab.
2. Click the Secondary Click menu.
3. Choose Click in Bottom Left Corner (or keep Click with Two Fingers if that's your habit).

Left-handers who rest their hand on the left side of the trackpad often prefer the bottom-left corner for the same reach reasons right-handers pick bottom-right. Try both for a day; the setting flips back just as easily.

What doesn't need changing

macOS has no global "left-handed mode," and you don't need one. Keyboard shortcuts, scroll direction, and gestures are all hand-agnostic. Two things people expect to change but shouldn't bother with:

• Scrolling — wheel and gesture scrolling behave identically in either hand. If scrolling feels backwards, that's the separate Natural scrolling setting, not a handedness issue.
• Gaming mice with thumb buttons — side buttons are physically placed for one hand. macOS can't mirror those; check whether the manufacturer's software has a left-hand profile, or pick an ambidextrous model.

To undo everything, set Primary mouse button back to Left and the trackpad's Secondary Click back to its previous choice — the defaults macOS shipped with.

Give it a real trial

If you're switching hands for ergonomic reasons — mousing-arm strain is the usual driver — expect an awkward first week. Pointer accuracy in your non-dominant hand improves dramatically with a few days of ordinary use, and the button swap above removes the one genuine obstacle; the rest is practice. Two tips that ease the transition: drop Tracking speed in the Mouse settings a notch while your aim catches up, and lean on keyboard shortcuts (Cmd + Tab, Cmd + W) for the precision clicks you'd otherwise fumble. Many people end up ambidextrous mousers, switching sides whenever one arm gets tired — the per-user settings stay put either way, so the swap is a one-time job.