Step-by-step process
Windows 10
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Expand the system tray and right-click the speakers icon.
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Select "Open Sound settings".

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Under Input, select "Device properties".

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Under Device properties, select "Additional device properties".

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On the top menu, select "Levels".
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Move the Vertical bars to adjust the "Microphone" and "Microphone Boost" accordingly.

Windows 11
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Right-click the volume icon in the taskbar and select “Sound settings”.

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Select “More sound settings” under “Advanced”.

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Select “Recording”.
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Right-click on the “Microphone” tile and select “Properties”.

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Click “Levels”.
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Adjust the slider under “Microphone Boost” accordingly.

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Click “OK”.