The Single-Screen Constraint
You are a financial analyst who works at a large desk with two massive monitors. You are used to having your complex Excel spreadsheet open on the left screen and your source data PDF open on the right screen. It makes cross-referencing data incredibly fast and easy.
However, you frequently travel for work. When you sit in a coffee shop with just your 13-inch MacBook, your productivity crashes. You are forced to constantly switch back and forth between the Excel window and the PDF window, breaking your concentration and slowing you down.
If you also happen to own an iPad, you do not need to suffer through a single-screen workflow. Apple built a brilliant feature into macOS called Sidecar. With zero cables and zero third-party software, Sidecar allows you to wirelessly transform your iPad into a fully functional, high-resolution second monitor for your Mac. You can literally drag your PDF off the edge of your MacBook screen and drop it onto the iPad screen, instantly recreating your dual-monitor desk setup anywhere in the world.
Sidecar vs. Universal Control: What is the Difference?
Before proceeding, it is critical to understand the difference between Sidecar and Apple’s other feature, Universal Control, as they sound similar but do completely different things.
- Universal Control: The iPad remains an iPad. It runs iPad apps (like the iPad version of Safari). You are simply using the Mac’s physical mouse and keyboard to control the iPad.
- Sidecar: The iPad ceases to be an iPad. It becomes a “dumb” external monitor for the Mac. It displays Mac windows, Mac software, and the macOS menu bar. You cannot open iPad apps while Sidecar is running.
Hardware Requirements
Because Sidecar relies on streaming a high-resolution video feed over Wi-Fi with zero latency, it requires relatively modern hardware.
- Mac: Most Macs introduced in 2016 or later running macOS Catalina or newer.
- iPad: Most iPads introduced in 2018 or later (must support the Apple Pencil).
- Both devices must be signed into the exact same Apple ID, have Bluetooth and Wi-Fi turned on, and be physically close to each other.
Activating Sidecar
Setting up your second screen takes about three seconds.
- Wake up your iPad and unlock it. Place it next to your Mac.
- On your Mac, look at the top-right corner of the menu bar and click the Control Centre icon (it looks like two small toggle switches).
- Click the Display (or Screen Mirroring) button.
- You will see a list of available devices. Your iPad’s name should appear under a section labeled “Connect to.” Click your iPad’s name.
Instantly, the iPad screen will flash, and your Mac desktop background will appear on the tablet. You now have a dual-monitor setup.
Managing Your Windows
By default, Sidecar “Extends” your desktop. This means the iPad acts as additional physical space to the right of your Mac screen.
- Click and hold the top bar of any window on your Mac (e.g., a Safari window).
- Drag it all the way to the right edge of your Mac screen.
- Keep dragging, and you will see the window slide across the physical gap and appear on the iPad screen.
You can also use a faster shortcut: Hover your mouse over the green “Full Screen” dot in the top-left corner of any Mac window. A menu will appear with the option to Move to [Your iPad Name]. Clicking this will instantly teleport the window to the tablet.
Conclusion
Stop struggling to do complex work on a single laptop screen when you travel. By utilizing macOS Sidecar, you can wirelessly repurpose your iPad into a portable second monitor, giving you the screen real estate you need to stay productive anywhere.