How to Arrange Displays on Mac (Main Display + Alignment)

If your pointer vanishes off the right edge and reappears on a monitor that's physically on your left, your arrangement doesn't match your desk. Two minutes in the Displays settings fixes the geometry, puts the menu bar on the right screen, and makes the pointer cross exactly where the bezels meet.

Open the arrangement view

1. Open System Settings → Displays.
2. Click Arrange… — the button appears whenever more than one display is connected.
3. You'll see a blue rectangle per display. Click and hold one and the matching physical screen highlights with a red border, so you always know which is which.

The pane is the same on macOS 13 Ventura, 14 Sonoma, and 15 Sequoia.

Match the rectangles to your desk

Drag each rectangle so the layout mirrors reality: the monitor on your left goes on the left, a screen on a riser sits higher, a laptop below an external display sits underneath it. Displays can sit side by side, stacked vertically, or offset diagonally — the only rule is that edges must touch, because the shared edge is where the pointer and dragged windows cross.

Nothing moves on your desk, obviously — you're telling macOS where things already are. Get this right and the pointer stops teleporting.

Set the main display

One rectangle has a white strip across its top — that's the menu bar, and it marks the main display. Drag the strip onto whichever monitor should be primary. The main display is where:

• the Dock lives by default,
• alerts, dialogs, and login items appear,
• apps open when they have no remembered window position,
• the desktop's icons gather.

With Displays have separate Spaces on (the default), every display shows a menu bar — but the main one still decides everything in that list. If new windows keep appearing on your laptop screen instead of the big monitor, moving this strip is the fix.

Align the crossing point

Monitors of different sizes need vertical nudging. Suppose a 27-inch display sits next to a MacBook: if the rectangles' top edges are aligned but the physical screens aren't, the pointer will cross at the wrong height and hit an invisible wall everywhere else. Nudge the smaller rectangle up or down until the on-screen shared edge corresponds to where the screens actually line up on your desk. Test it by sweeping the pointer across at a few heights — a correct arrangement feels like one continuous surface.

Quirks worth knowing

• Arrangements are per-setup. macOS remembers the layout for each combination of displays, so your desk at home and the office dock each keep their own arrangement.
• Mirroring lives elsewhere. To show the same image on both screens, select a display in the Displays pane and change Use as to mirror — arranging is only for extended desktops.
• A window straddling the boundary shows on both screens; it belongs to whichever holds more of it once you release.
• Vertical monitors need one more step. Arranging only sets position; if a monitor is physically rotated portrait, select that display in the Displays pane and set Rotation to 90° or 270°, then drag its now-tall rectangle into place in the Arrange view.
• Keyboard focus follows the front window, not the display your pointer is on — typing goes to whichever window is active, wherever it lives. If you expect focus to follow your eyes across monitors, it's the window you need to click, not the screen.

Windows still opening on the wrong screen?

Arrangement sets the stage, but apps also remember their own positions — see how to stop apps opening on the wrong display for the re-homing routine.