If you don't see what you expect to see on your second screen, check the video cables.
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Check the connections: Make sure all the video connections are secure. Use a video cable that's no more than 6 feet (1.8 meters)—longer cables can affect video quality.
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Verify the cable supports video: Use the cable that came with your monitor or make sure that the cable supports video. Always do this with Surface devices with USB-C ports.
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Try a different video cable: If the cable the came with your monitor isn't responding, use a different video cable to connect your Surface.
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Using a video extension cable or video converter: Remove it from your set up to see if it's causing the problem.
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Using a video adapter from another company:  If you're using a third-party adapter, please contact the manufacture for help.
