How to Split Screen on Mac: Complete Window Tiling Guide

To split screen on Mac, drag a window to the left or right edge of your screen until a translucent placement outline appears, then release it (macOS Sequoia). On macOS Sonoma, Ventura, and earlier, hover your cursor over the green full-screen button at the top-left of any window, select Tile Window to Left of Screen or Tile Window to Right of Screen, and click an open companion window to lock both apps into a side-by-side Split View.

macOS Sequoia Native Window Tiling

macOS Sequoia (macOS 15) introduced native window snapping similar to modern tiling managers:

1. Drag any window's title bar directly to the left or right edge of your screen.
2. A translucent gray placement outline appears, indicating the half-screen boundary.
3. Release your cursor, and the window snaps smoothly into position occupying exactly 50% of your screen.
4. Drag another window to the opposite edge to complete the side-by-side workspace.

Split View in macOS Sonoma, Ventura, and Earlier

On macOS Sonoma and earlier releases, Apple uses Split View built into the window control buttons:

• Hover your cursor over the green full-screen button in the top-left corner of any window.
• In the menu that appears, click Tile Window to Left of Screen or Tile Window to Right of Screen.
• Your desktop enters a dedicated Split View space. Click any other open window from the thumbnail picker to fill the remaining half.

Adjusting the Split Ratio and Swapping Sides

You are not locked into a strict 50/50 partition:

• Click and drag the vertical black dividing line between the two apps to adjust the width (e.g., 70/30 for wide code editors or spreadsheets).
• To swap positions, click and drag a window header to the opposite side of the screen.

Keyboard Shortcuts for Quick Window Tiling

In macOS Sequoia, you can snap windows using menu bar hotkeys:

• Open the Window menu and select Move & Resize.
• Use Fn + Control + Left Arrow to snap left, or Fn + Control + Right Arrow to snap right.
• To return to full floating mode, select Return to Previous Size.

Multi-Monitor Split Screen and Dock Mirroring

Working across multiple displays with tiled windows often introduces friction because the macOS Dock stays trapped on only one screen, and external monitors require fiddling with physical hardware buttons for brightness.

Supercharging Multi-Display Workflows with Tegaro

The Tegaro Displays module provides hardware DDC/CI external monitor brightness and contrast control using native I2C communication, plus multi-monitor Dock mirroring that projects a fully interactive Dock copy onto every connected screen.

Frequently Asked Questions