Disabling Microphone playback

You should be able to turn off microphone playback through the speaker’s Control Panel settings:

1. Right-click the speaker icon in the notification area
2. Select Playback devices
3. Right-click the output device
4. Select Properties
5. Click the Levels tab
6. Find the Microphone device
7. Click the speaker icon next to the microphone to mute it
8. Click [OK] in the two dialog boxes

For Windows 10:

1. open Sound settings

2. click on App volume and device preferences

3. set the Output to Realtek Digital Output (or whatever output device you're using).