Go to Start > Settings > System > Sound. In Input, go to Choose your input device, then select Device Properties. On the Levels tab of the Microphone Properties window, you can adjust the Microphone and Microphone Boost sliders as needed, and then select OK.
Also the question is, how do I set the gain on my microphone? Turn the dial on your microphone clockwise to increase the gain. Most USB microphones have control knobs right on them, so adjusting the gain takes no time at all. Locate the dial, which will likely be marked gain and have a small, white stripe on it. Raise the gain to increase the volume.
Beside above, how do I adjust microphone sensitivity in Windows 10? To change microphone sensitivity in Windows 10, open the Settings window, select the Input option and Choose your input device and click on its property box which will open up the Microphone Properties window. Now, select the Levels tab and then change the sensitivity according to your need.