You can find this setting in Settings -> Devices between Microphone selection and 'Make a Test Call.

Just bought a Logitech H390 and the microphone does not work on my Windows 10 Dell Precision 5530. Select Troubleshoot sound problems and wait. I have searched online and it seems there isn't much to do as the A2DP profile would configure the device as audio output only preventing the mic from working. In here, look for the headphones or the sound device you want to update the drivers for. Yes, we’re done setting the headset as our default device.

Windows 10 may not hear your microphone’s audio for several reasons.Headphone mic not working windows 10 The Logitech g430 mic may not work properly if the audio driver is corrupted or faulty.