Photos
In photo mode, some photos are “live photos” & some are “videos”. I just want to take a single photo. Happens outdoors.
iPhone SE, iOS 13
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See the following from Take and edit Live Photos - Apple Support
How to turn off Live Photos
Tap the Live Photos button 
to turn off Live Photos. A slash through the Live Photos button means the feature is off.
The Camera app turns Live Photos on again automatically. To keep Live Photos off permanently, follow these steps:
- Open the Settings app.
- Tap Camera > Preserve Settings.
- Make sure that the switch next to Live Photos is turned on.