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Set up dual monitors on Windows 10
To get your PC to recognize multiple monitors:
Make sure your cables are connected properly to the new monitors, then press Windows logo key  + P to select a display option.
If you need more help, here's what to do: 
  1. Select Start > Settings > System > Display . Your PC should automatically detect your monitors and show your desktop. If you don't see the monitors, select Detect .
  2. In the  Multiple displays  section, select an option from the list to determine how your desktop will display across your screens. 
  3. Once you've selected what you see on your displays, select Keep changes .
You can change the resolution of your displays. However, we suggest using the recommended resolution to get the most out of your displays.
https://msegceporticoprodassets.blob.core.windows.net/inline-media/bdf9c75a-59ea-418f-900e-5c4281b9c3f8-en
Set up dual monitors on Windows - Microsoft Support
Learn how to connect and configure multiple displays on your Windows 10 PC. Follow the steps to select a display option, adjust the resolution, and use the monitors in Windows.
Set up dual monitors on Windows - Microsoft Support
Set up dual monitors on Windows. To get your PC to recognize multiple monitors: Make sure your cables are connected properly to the new monitors, then press Windows logo key + P to select a display option. If you need more help, here's what to do:
Screen mirroring and projecting to your PC or wireless display
Cast to a display from a Windows PC. You can wirelessly connect your PC to a TV, projector, or other kind of external display that supports Miracast. Turn on your TV, projector, or other display. If you're using a Miracast dongle or adapter, make sure it's plugged in to the display.
Present on multiple monitors (and view speaker notes privately)
You can present with 2 monitors: Using Presenter View is a great way to view your presentation with speaker notes on one monitor (your laptop, for example), while your audience views the notes-free presentation on a different monitor (like a larger screen you're projecting to).
Applies To: PowerPoint for Microsoft 365, PowerPoint 2021, PowerPoint 2019, PowerPoint 2016, PowerPoint 2013
Troubleshoot connecting Surface to an external display
Solution 1: Power reset your external display. Solution 2: Check the video input settings. Solution 3: Check the port version setting on the external display. Solution 4: Duplicate or extend your display on the external screen. Solution 5: Check the video cables. Solution 6: Check the display adapter.
Connect Surface to a TV, monitor, or projector
Connect your Surface on Windows 10 to a TV, external display, or projector by using the Surface HD Digital AV Adapter or the Surface VGA Adapter.
View display settings in Windows - Microsoft Support
Open Display settings. Learn how to use the Settings app to view and change display settings in Windows.
Set up a Surface USB-C to display adapter - Microsoft Support
Surface accessories. Set up a Surface USB-C to display adapter. Surface Devices Surface. See things on a bigger screen by connecting one of the Surface USB-C to display adapters to an external monitor or TV. Here’s what you’ll need: A Surface USB-C to display adapter. This can be any of the following:
Get more done with multitasking in Windows - Microsoft Support
Learn three different ways to multitask and use multiple desktops in Windows 10. Select the Task View icon on the taskbar, or press Alt-Tab on your keyboard to see apps or switch between them. To use two or more apps at a time, grab the top of an app window and drag it to the side.