Portrait Mode is an iPhone feature that blurs the background from the subject in a photo. But if you change your mind later, it’s possible to remove Portrait Mode from a picture after the fact (via Reddit)
Remove Portrait Mode
- After taking a Portrait Mode photo, open Photos.
- Tap on Edit in the upper-right corner.
- Tap the yellow Portrait button at the top, then tap Done in the bottom-right.
You can turn it on and off at will and change your mind later, because Apple’s non-destructive editing means you can tap the Revert button in editing mode to give you the original photo.