As on Linux, it’s possible to select the audio source and sink on a per-app basis. This interface is buried in Windows control panel. The current name is “App volume and device preferences”. You can set the volume, source (input) and sink (output) for each app.

This is helpful say when an app where one-way high fidelity audio is desired instead defaults to two-way low fidelity audio. Also, modern Bluetooth devices may have the ability to use two-way audio with high fidelity listening by using A2DP for output with headset microphone input.