How to share your iPhone screen in FaceTime.
Screen sharing lets everyone in a FaceTime call look at photos, browse the web, or help each other out.
1: Start a FaceTime call.
2: Tap the Share Content button 
.
.3: Tap Share My Screen .
.Everyone can see what's on your screen until you stop sharing, but they can't control anything on your device. If you get any notifications while sharing your screen, others won't be able to see them.
When you're sharing your screen, others won't be able to see content that requires a subscription, a free trial, or a purchase or rental to view. With SharePlay, you can watch video together, listen to music together, or work out together by sharing content through supported apps.
For more details, please go to the following link below:
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