When using multiple monitors with a macOS device, you have the flexibility to set one of them as the primary display. The primary display is essential as it hosts the menu bar, dock, and is the main workspace. It's also where new windows and apps will appear by default. This can be beneficial in situations where you're using a larger external monitor for work or gaming and would like it to be your main screen.

While macOS tends to assign the built-in display of a MacBook as the primary display, you can easily alter this preference. The process is straightforward and only requires a few steps via the Displays settings in the System Settings.

Steps to change the primary display in macOS:

  1. Open System Settings from the Apple menu at the top left of the screen.
  2. Open Displays preference panel.
  3. Click on the display that you want to set as the main display.
  4. Click on the Use as select list.
  5. Select Main display.
  6. Close the Displays preference panel.
  7. Verify the tool bar and dock is now at the top of the new main display.
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