How To Do Split Screen On Mac

Tips
1

I’m trying to work with two apps side by side on my Mac, but I can’t figure out how to properly set up split screen or keep windows evenly arranged. I’ve tried dragging the corners and using full screen, but it never sticks the way I expect. Can someone walk me through the right steps or settings to use split screen mode on macOS?

2

On macOS there are two main ways to do split screen. Sounds like you are mixing them a bit.

  1. Using official Split View

This keeps two apps locked side by side.

  1. Move mouse over the green traffic light button in the top left of a window.
  2. Wait a second. A small menu shows:
    • Enter Full Screen
    • Tile Window to Left of Screen
    • Tile Window to Right of Screen
  3. Pick left or right.
  4. Your other open windows show on the empty side. Click the second app you want.

To leave Split View:

  1. Move mouse to top so the menu bar drops down.
  2. Click the green button on either app. It exits Split View.

Checks:
• System Settings > Desktop & Dock > under “Windows & Tabs” make sure “Displays have separate Spaces” is ON. If it is OFF, Split View acts weird or fails.
• Split View works best on macOS 10.11 and newer. On older versions behavior is different or missing.

Resize in Split View:
• Move the vertical divider between the two apps.
• Drag left or right to change how much space each app uses. Some apps like certain games or old tools block resizing.

  1. Manual side by side without Split View

If you dislike Spaces or full screen:

  1. Put both apps in normal windowed mode.
  2. Click and hold the green button on a window. Drag it to a side to snap half the screen on newer macOS versions. If the snap effect fails, do it manual:
    • Drag the window top bar to one side.
    • Drag edges until it fills that half.
  3. Do the same with the second app on the other side.

Extra shortcuts that help:

• Mission Control key (often F3) or swipe up with 3 or 4 fingers on trackpad. Lets you see if your apps are stuck on separate Desktops. Drag windows into the same Desktop if they are separated.
• Hold Option while clicking the green button. Sometimes macOS shows more layout behavior depending on version.

Common issues:

• If green button does not show “Tile window to left/right”:

  • You run an older OS like Yosemite. Split View started in El Capitan.
  • The app does not support Split View. Try with Safari and Notes to test.

• If windows keep jumping to full screen:

  • Avoid single click on green button. Use hover and choose tile.
  • Or double check you are not using triple finger swipe into a different Space.

If you tell your macOS version and exact apps, people here can spot if one of them simply does not support Split View properly.

3

Couple more tricks that might help, without rehashing what @hoshikuzu already covered:

  1. Turn off “Automatically rearrange Spaces”
    macOS loves to “help” and it’s probably what’s making your windows not stay put.

    • System Settings → Desktop & Dock
    • Scroll to “Mission Control” section
    • Turn OFF “Automatically rearrange Spaces based on most recent use”
      This keeps your desktops / Split Views from shuffling around when you switch apps.

  2. Use per‑app “Assign to Desktop” so layouts stay stable
    If you like a certain pair of apps side by side all the time:

    • Put them how you like (either Split View or just two windows filling left/right).
    • Right‑click the app icon in the Dock
    • Options → “Assign to This Desktop”
      Do that for both apps.
      Then when you open them later, macOS pushes them back to that desktop instead of randomly spawning them somewhere else.

  3. Avoid full screen for “classic” side by side
    Full screen + Spaces is what often makes everything feel jumpy. If you just want a Windows‑style split:

    • Keep both windows in normal mode
    • Use the green button to “zoom” them to a nice size, then drag to edges so they kind of “snap”
    • Don’t hit the full‑screen option at all
      It’s boring but much more predictable.

  4. Trackpad gestures are probably messing with you
    If your layout seems to vanish when you swipe:

    • System Settings → Trackpad → More Gestures
    • Temporarily disable “Swipe between full‑screen apps”
      That way a stray 3‑finger swipe doesn’t fling you into some other Space and make it look like your split just died.

  5. Create a dedicated “work” desktop and leave it alone

    • Open Mission Control
    • Add a new Desktop at the top
    • Put only your side‑by‑side apps there
    • Don’t full screen anything on that desktop
      This keeps stuff much more “sticky” and you can bounce in and out without your layout constantly changing.

  6. Some apps just suck at tiling
    Not everyone abides by macOS window rules. Electron apps, old Java tools, some games, etc, ignore nice tiling and size limits. If split is never even, try with Safari + Notes first.
    If that combo behaves, then the problem is the app, not you or Split View.

If you say which macOS version you’re on and which exact apps you’re trying to pair, people can usually point out “oh yeah, that one doesn’t cooperate” and suggest a workaround like using a third‑party tiler instead.