The Single Screen Problem
If you work at a desk with a massive 27-inch external monitor, you know how incredibly productive dual-screen setups can be. You can have your research open on the left monitor while you write your report on the right monitor. However, the moment you unplug your MacBook and go to a coffee shop, an airport, or a client’s office, you lose that productivity. You are suddenly forced to cram all your work back onto a single, claustrophobic 13-inch laptop screen.
Historically, travelers tried to solve this by buying expensive, heavy, third-party portable monitors, along with a mess of HDMI and power cables. But if you already own an iPad, you already own a stunning, high-resolution portable monitor.
Apple realized this and built a native feature into macOS called Sidecar. With zero cables and zero third-party software, Sidecar allows your Mac to wirelessly hijack your iPad’s screen. Your Mac instantly recognizes the iPad as a legitimate, secondary external monitor, allowing you to drag windows off the edge of your laptop screen and onto the tablet.
Requirements for Sidecar
Because Sidecar streams a high-resolution, low-latency video feed through the air, it requires relatively modern hardware and strict Apple ecosystem compliance.
- Hardware: You need a Mac from 2016 or later and an iPad from 2018 or later.
- The Account: Both devices must be signed into the exact same Apple ID.
- The Connection: Both devices must have Wi-Fi and Bluetooth turned on, and they must be physically close to each other (within 30 feet).
If you meet these requirements, the connection is flawless.
Initiating the Connection
You trigger Sidecar directly from your Mac’s control panel.
- Turn on your iPad and unlock it so it is sitting on the home screen.
- On your Mac, look at the top right corner of the menu bar and click the Control Center icon (the two small toggle switches).
- Click the Display or Screen Mirroring button.
- A dropdown menu will appear. If your iPad is nearby and unlocked, its name (e.g., “John’s iPad”) will magically appear in the list.
- Click the iPad’s name.
Instantly, your iPad screen will flash, the Apple app icons will vanish, and it will be replaced by your Mac’s desktop wallpaper. You now have a dual-monitor setup.
Using the Extended Display
By default, Sidecar acts as an “Extended Desktop.” This means the iPad acts as extra physical space to the right of your Mac.
To use it, grab a window on your Mac (like a web browser), drag it all the way to the right edge of your laptop screen, and keep pushing. The window will slide completely off the Mac and appear on the iPad screen. You can use your Mac’s trackpad to move the mouse seamlessly between the two devices.
If the physical alignment is wrong (e.g., you placed the iPad on the left side of your laptop, but the mouse thinks it’s on the right), you can fix it easily.
- On your Mac, open System Settings.
- Click Displays.
- You will see a diagram showing two screens. Simply click and drag the iPad icon to the left side of the Mac icon to match your physical desk setup.
The Apple Pencil Bonus
Sidecar has one massive advantage over a traditional external monitor: it supports touch input via the Apple Pencil. If you drag Adobe Photoshop or Illustrator onto the iPad screen, you can use your Apple Pencil to draw directly into the Mac application, effectively turning your iPad into a professional Wacom drawing tablet for your Mac.
Conclusion
Stop struggling with a single small screen when working remotely. By utilizing macOS Sidecar, you can instantly and wirelessly transform your iPad into a beautiful, secondary external monitor, doubling your digital workspace in seconds.