Huawei P9 Lite - Manual (Page 108)

Camera and Gallery
101
Launching the camera from Gallery
1
Open Gallery.
2 Go to the Photos tab and swipe down to display the viewfinder in half screen mode.
Swipe down again to launch the camera.
Not all camera features are available in half screen mode.
3 Select the desired shooting mode. For more information, see Shooting modes .
4
Touch to take a photo.
5
Touch Return to return to Gallery.