Sony Xperia XZ2 Manual page 119

Photo Viewfinder appears.
If confirmation appears, follow onscreen instructions.

Alternatively, Long Press

quick-activate Camera.
If there is no operation for about three minutes on Viewfinder (about 30 seconds when

quick-activated), Camera operation ends.
Swipe (Flick) Photo Viewfinder to switch to Video Viewfinder
Swipe (Flick) up or down in a landscape viewfinder, or left or right in a portrait viewfinder.

To use Camera app, select an application in CAMERA APPS.

xperia-xz2_07_Camera.docx
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for one second or more, or in Lock Screen Flick to