Here’s some troubleshooting tips I’ve located for you. Hope it has useful information.
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If the monitor does not show up in the settings, use these steps before messing around with the configuration settings on Windows 10:
Confirm the monitor is connected to a power source.
Confirm the monitor is turned on.
Turn the computer off and on to refresh the connection.
Use the monitor's built-in controls and select the correct input port.
Check the signal cable connection between the monitor and the graphics card.
Disconnect the signal cable from both ends, wait 60 seconds, and firmly reconnect it.
Change the signal cable to confirm you are not dealing with a bad cable.
DisplayPort and HDMI come in different versions, so check the manufacturer for requirement details to ensure you have the correct cable.
Change ports if the monitor and graphics card feature multiple ports.
Connect the monitor to another computer to see whether the problem is with the external display.
Connect another known working monitor to determine that the issue is not the graphics card.
Disconnect all peripherals (such as printers, cameras, and USB devices) to confirm none of the other devices are conflicting with the display.
If you have a Surface Pro 8 connected to a dock station, disconnect it and try to connect the monitor directly to the computer to confirm the problem is not the dock.
Update the external monitor firmware to help fix bugs and compatibility issues (uncommon).
If the basic troubleshooting steps outlined above do not fix the second monitor, it could be a software-related problem, which you may be able to fix with the steps below
How to fix external monitor connection issues via Settings
After determining that there isn't a physical problem with the connection, monitor, or computer, you can use the Settings app to force the system to detect the second monitor.
Force second display detection
To detect a second monitor manually on Windows 10, use these steps:
Open Settings.
Click on System.
Click on Display.
Under the "Multiple displays" section, click the Detect button to connect to the external monitor.
(Optional) Under the "Rearrange your displays" section, click the Detect button in the bottom-right corner (if applicable). Quick note: If you have only one monitor, the option will not be present since it's only available when connecting multiple displays.
Once you complete the steps, Windows 10 should detect the external monitor connected to the computer
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