How to take full-screen photos with Apple's mobile phone?

Apple's mobile phone takes full-screen photos as follows:

1, open "Camera" on the phone desktop.

2. On the "Photo" function page, click "White Circle" to take a photo.

3. In the gallery, you can see that the photo just taken is not full screen, and there are black edges at the top and bottom of the screen.

4. Return to the "Video" function page and click the "red circle" to take a photo.

5. When taking photos, click the "white circle" on the left to take photos.

6. When you return to the gallery, you can see that the photo you just took is displayed in full screen. So you can take full-screen photos.