Let others hear you better by opening Control Center while on a call. Tap "Mic Mode" and select "Voice Isolation." (This also works on a regular call)
Isolate your voice when talking
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How to Share your screen in FaceTime
To share what happens on your device click on the iPad with a person in front and select "Share My Screen".
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6 FaceTime Features for Video Calls and Screen Sharing
How to schedule FaceTime calls, blur background, share screen, watch videos together, and use voice isolation