Quick Answer
Press Windows key + P and choose Duplicate to mirror your laptop screen on the second display or Extend to use both screens as one large desktop. The same options are in Settings → System → Display under the “Multiple displays” drop-down, where you can also drag the display thumbnails to match how the monitors sit on your desk and set which one is the main display. For a TV or projector without a cable, press Windows key + K to connect to a Miracast wireless display first, then use Win + P.
Key Takeaways
- Win + P is the fastest switch: PC screen only, Duplicate, Extend, Second screen only.
- Duplicate shows the same image on both screens (presentations); Extend gives you more workspace (productivity).
- In Duplicate mode both screens run at the lower of the two resolutions, so text may look soft on the better display.
- Arrange the thumbnails in Display settings so the mouse crosses between screens at the right edge.
- If the second screen is not detected, click Detect, reseat the cable, and update the graphics driver.
Windows 11 can show your desktop on a second monitor, a TV or a projector in two ways: duplicating it so both screens show the same thing, or extending it so the second display becomes extra desktop space. The setting is easy to switch but easy to get wrong, which is why so many people end up with a presentation stuck on the laptop screen or a mouse pointer that disappears off the wrong edge. This guide covers the keyboard shortcut, the full Settings route, wireless displays, and the fixes for a screen that will not duplicate or extend.
Duplicate vs Extend: Which One to Use
| Mode | What you see | Best for | Drawback |
|---|---|---|---|
| Duplicate (mirror) | Identical image on both displays | Presentations, classrooms, showing a TV what is on the laptop | Both screens drop to the lower shared resolution |
| Extend | One wide desktop across both displays | Multitasking, reference material on one screen and work on the other | Audience sees only what you drag to the second screen |
| Second screen only | Laptop screen off, external display active | Docked laptop with a big monitor, saving battery | Laptop screen goes dark |
| PC screen only | External display off | Temporarily ignoring a connected TV | — |
Method 1: The Windows Key + P Shortcut
- Connect the second display by HDMI, DisplayPort, USB-C or a dock, and turn it on.
- Press Windows + P. A panel slides in from the right with four options.
- Choose Duplicate to mirror or Extend to add desktop space. The change applies instantly; press Win + P again to switch back.
The panel also appears when you press the Fn + F-key combination with a monitor icon on many laptops (F4 on Dell, F7 on Lenovo and HP, F8 on ASUS). Both routes do the same thing.
Method 2: Settings → System → Display
- Right-click an empty area of the desktop and choose Display settings, or open Settings → System → Display.
- At the top, the connected screens appear as numbered thumbnails. Click Identify to flash the number on each physical screen.
- Open the Multiple displays drop-down and pick Duplicate these displays or Extend these displays. Click Keep changes when prompted.
- In Extend mode, drag the thumbnails so their positions match the real monitors, for example laptop on the left and monitor on the right, so the cursor moves naturally between them. You can also align the tops or bottoms so the pointer does not jump.
- Tick Make this my main display on the screen where you want the taskbar, Start menu and new windows to appear.
If the second screen is not listed, click Detect under the thumbnails. For step-by-step cabling and dock advice see our guide to connecting a second monitor on Windows 11.
Fix Resolution, Scale and Refresh Rate per Screen
In Extend mode each display keeps its own settings. Click a thumbnail, then scroll to Scale (125–150% suits most laptops, 100% suits a 24-inch 1080p monitor), Display resolution (use the recommended native value) and, under Advanced display, the refresh rate. In Duplicate mode Windows forces both displays to a resolution they share, so a 4K monitor mirrored from a 1080p laptop runs at 1080p; if sharpness matters, use Extend and drag the window to the better screen instead.
Duplicate or Extend to a TV Wirelessly
Most smart TVs, Roku and Fire TV devices, and Miracast adapters accept a wireless display from Windows. Press Windows + K, select the TV from the list and accept the prompt on the TV. Windows starts in Duplicate mode; press Win + P to change to Extend. Wireless mirroring adds a small delay, so it is fine for slides and video but not for games or fast cursor work. If the TV does not appear, confirm both devices are on the same Wi-Fi network and that the TV’s screen-mirroring feature is switched on.
Using a Laptop With the Lid Closed
If you want only the external monitor, choose Second screen only or set the laptop to stay awake when closed. The lid setting is under Control Panel → Power Options → Choose what closing the lid does; set “When I close the lid” to Do nothing while plugged in. Our article on stopping laptop sleep when the lid closes covers the details for Windows and Mac.
Troubleshooting When Duplicate or Extend Does Not Work
- Second screen not detected: reseat both ends of the cable, try another input on the monitor, and click Detect in Display settings. USB-C ports that are data-only will not drive a display; use the port marked with a DisplayPort or Thunderbolt symbol.
- Duplicate is greyed out: the two displays share no common resolution, which happens with some ultrawide monitors. Set the external display to a standard resolution first, or use Extend.
- Only one option in Win + P: the graphics driver may be missing. Update it from Windows Update → Advanced options → Optional updates, or from the Intel, AMD or NVIDIA site.
- Blank screen after choosing a mode: wait 15 seconds; Windows reverts automatically if you do not click Keep changes.
- Different scaling makes text blurry when windows move between screens: set both displays to the same scale, or sign out and back in after changing scale.
- Projector shows the desktop but not your slides: PowerPoint uses Presenter View on an extended display; switch to Duplicate, or in PowerPoint choose Slide Show → Monitor → the projector.
The Mac Equivalent in Brief
On macOS open System Settings → Displays, click the external display and set Use as to Mirror for Built-in Display (duplicate) or Extended display. Dragging the thumbnails arranges the screens, and holding Option while clicking Scaled reveals every resolution.
Frequently Asked Questions
What is the shortcut to duplicate the screen in Windows 11?
Press Windows key + P and choose Duplicate. The same panel offers Extend, Second screen only and PC screen only.
What is the difference between duplicate and extend display?
Duplicate mirrors the same image on both screens and is used for presentations. Extend treats the second screen as additional desktop space so you can run different windows on each display.
Why is Duplicate greyed out in Windows 11?
The two displays have no resolution in common, which can happen with ultrawide or very high-resolution monitors. Set the external display to a standard resolution such as 1920 × 1080 or use Extend mode instead.
How do I duplicate my laptop screen to a TV without a cable?
Press Windows key + K, select the TV or Miracast adapter from the list and accept the prompt on the TV. Windows mirrors the screen by default; press Win + P to switch to Extend.
Why does my second monitor say no signal?
Check the cable at both ends, select the correct input on the monitor, make sure the laptop USB-C port supports video output, and click Detect in Settings → System → Display. Updating the graphics driver fixes most remaining cases.
Conclusion
Duplicating or extending a Windows 11 screen comes down to one shortcut, Windows + P, with the Display settings page for fine-tuning layout, scale and the main display. Use Duplicate when an audience needs to see exactly what is on your laptop and Extend when you need more room to work, and remember that Duplicate drops both screens to a shared resolution. When a screen refuses to appear, the cable, the port and the graphics driver solve almost every case.
