Spatial Audio in the FaceTime app open Control Center, tap Mic Mode, then select Voice Isolation.
When you want your voice and all the sounds around you to be heard in a FaceTime call, you can turn on Wide Spectrum mode (available on open Control Center, tap Mic Mode, then select Wide Spectrum.
When you’re on a FaceTime call, tap the screen to show the FaceTime controls (if they aren’t visible), then tap Change FaceTime video settings on iPad