Every computer I’ve called my own for work or personal use has been a laptop. I love the portability of a laptop. It’s great to do work while lounging in my favorite chair or at a coffee shop (when we could still do that). But it’s really hard for me to put in a full workday hunched over one. To fix that, I’ve found that plugging my laptop to an external monitor on my desk is essential for me to be productive. Now I can’t imagine working without one.

If you’re considering adding an external monitor to your macOS setup to help fix that laptop hunch or just to add some extra screen real estate, read on. I’ll walk you through how to set up the external monitor with your Mac and adjust your display settings so that you can make the monitor fit your work style. (We’ll offer the same advice for Windows PC users in an upcoming article.)

Check the ports on your monitor and your Mac

Before you even try to set up your monitor, check out its ports and the ports on your Mac so that you know what cables or adapters you need in order to connect them to each other.

These days, most monitors have at least one HDMI port on the back, like what you’ve probably seen on your TV. There’s also a chance that your computer can plug into that monitor with a USB-C cable.

Knowing what type of cable to plug into your Mac to send a signal to your monitor can be a bit trickier to figure out. If you have a Mac that was released in 2019 or later, it will have Thunderbolt 3 ports, which means you can plug a USB-C cable into one of those ports and hook the computer up to your monitor with a cable that has a USB-C or HDMI connector on the other end.

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If you have a Mac that’s older than that, though, you might need something else, such as a cable with Mini DisplayPort connector. Check out Apple’s full list of which of its computers have which ports on its website so you can figure out what cables you need to buy.

Configure your external monitor

Once you have the cables you need, plug in your monitor and set it up on your desk. Then turn on your Mac, log in, and plug your Mac into your monitor. When you do, what’s on your Mac’s screen should be mirrored on the external display. You can connect your Mac to the monitor before you turn it on, but the Mac won’t show up on the monitor until you actually log in.

If you have a MacBook and you want your external monitor to be your main display, make sure you’ve connected an external mouse and keyboard to your MacBook and that the computer is plugged into a power source. Then close the MacBook’s lid. Your monitor’s screen will likely fade to black for a second or two, and then it should display what’s on your computer.

If you want to use your external monitor as a second monitor, you’ll need to set things up. Open System Preferences and then click “Displays.”

The Displays menu has a few different tabs, but the one that matters if you’re going to set up a second display is the Arrangement tab. After you click on this tab, you’ll see a checkbox in the lower-left corner to “Mirror Displays.” Uncheck that box, and you’ll be able to use your Mac’s screen and an external monitor as two separate displays.

In the Arrangement tab, you can also tell your computer how each display is physically aligned on your desk. For example, in the arrangement I set up for two screens in the screenshot below, I can only drag something from the primary display (the one on the left with the white bar) to the secondary display on the right if it’s a place where they’re “aligned.”

However, this only replicates where your displays are in physical space. If you physically move your secondary display to a different spot on your desk and forget to change the arrangement in this menu, your computer will still treat the screens as if they are arranged in that original way. That can lead to some confusing situations where things may not drag across screens like you expect them to. Any time you change the way your displays are set up on your desk, make sure you adjust their arrangements in this tab.

One note about the primary display: that’s the only one that will show macOS notifications. To make a display the primary one, go to the Arrangement tab, click and hold on the little white bar above one of the displays, and drag it to the display that you want to be the primary.

The Displays menu in System Preferences also has a Display tab that lets you change your monitor’s resolution, rotation, and refresh rate (if that’s an option for your monitor); a Color tab that lets you set the color profile for your monitor; and the Night Shift tab that lets you change settings for a feature on Apple-made displays that gradually warms the color temperature of the display at night.

Once you’ve followed these steps, you should be set to use an external monitor with your Mac.

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