Adjusting Blur in Portrait Mode
For an iPhone XS or iPhone XR running iOS 12.1, you can adjust the amount of blur in a portrait mode photo before or after you press the shutter button.
Before taking a photo, tap the F-button at the top of the Camera app and adjust the slider until you are satisfied with the overall image.
Adjusting after taking a photo is just as fast: View the photo in the photo app, select Edit and then Depth . Adjust the blur again until you are satisfied.