Displays & Spaces · 6 minute read
How Mac Spaces work with multiple monitors
With more than one monitor, macOS can give each display its own set of Spaces. That flexibility is useful, but it also multiplies the number of anonymous desktops you can land in. A few settings and strong visual labels keep the arrangement legible.
Choose whether displays have separate Spaces
Open System Settings → Desktop & Dock, scroll to Mission Control and find ‘Displays have separate Spaces’. When it is on, each monitor can switch desktops independently and full-screen apps occupy one display. Changing this setting requires logging out and back in.
Leave it on if each monitor has a different role or you use full-screen apps often. Turn it off only if you prefer all displays to move together as one large workspace.
Give each screen a stable role
A simple two-screen arrangement puts the main project on the laptop or centre display and reference material on the second display. Keep communication on a predictable side rather than letting it follow whichever Space was used most recently.
In System Settings → Displays → Arrange, position the screen rectangles to match the physical desk. Pointer movement and the order shown by screen-detection tools then make more sense.
Export for each panel, not the whole desk
Each display has its own width, height and pixel density. A Retina laptop beside a standard-density ultrawide needs two different PNG dimensions even when both show the same project.
In a supported Chromium browser, SpaceStamp can request permission to read each connected display’s label, dimensions and pixel ratio. Safari only exposes the current display, so use the manual presets for the others. The resulting ZIP names every PNG with its display dimensions.
Good to know
Display access is a browser permission. SpaceStamp reads the dimensions only; it does not capture the screen or see your windows.
Quick answers
Can each monitor have different Spaces on Mac?
Yes, when ‘Displays have separate Spaces’ is enabled in Desktop & Dock settings. macOS requires you to log out after changing it.
Can a website detect every monitor connected to my Mac?
Supported Chromium browsers can expose display details after permission is granted. Safari does not currently provide the same multi-screen API, so a manual dimension fallback is still necessary.
Check the official Mac guidance
Menu names and options can change between macOS releases. These Apple references are the source of truth for the current controls.
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