Sony Xperia XZ2 Manual page 117

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 "SUPERIOR AUTO" or "MANUAL"
Swipe (Flick) up or down in a landscape viewfinder, or left or right in a portrait viewfinder.
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To use Camera app, select an application in CAMERA APPS.
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Aim Camera at subject
Shutter clicks and still image is saved.
xperia-xz2_07_Camera.docx
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Check Viewfinder, then