The Portrait mode is one of your camera’s features that automatically lets the camera focus on you. Once this feature is activated, it will blur out your background while maintaining the clarity of your portrait image.
All iPhone models from 2018 (XR and XS) to the latest iPhone 13 support Portrait mode.
1. Once you are in a FaceTime call, tap your video tile.

2. Tap the Portrait icon.
To disable Portrait mode, tap the Portrait icon again.

3. Tap the Resize Screen icon to return.

Now you can make video calls without worrying about your background!
Nifty feature, right?
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Thank you for all your helpful tips
Great feature