Samsung SM-A546W User Manual page 52

Apps and features
Separating the focus area and the exposure area
You can separate the focus area and the exposure area.
Tap the preview screen where you want the focus area to lock and hold until the AF/
AE lock frame appears on the screen, separates into AF lock and AE lock frames, then
rejoins to the AF/AE lock frame. Tap again and drag the AE lock frame to the location
where you want the exposure area to lock.
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