iOS 18
Use the Camera Control to open another app on iPhone
Instead of opening Camera, you can set the Camera Control (on supported models) to open the Magnifier app, the Code Scanner, or your favorite third-party camera app. You can also set the Camera Control to not open any app or feature when clicked.
Go to Settings , then tap Camera.
Tap Camera Control, then choose one of the following options:
Camera: Opens Camera.
Code Scanner: Opens a QR code scanner.
Magnifier: Opens the Magnifier app.
None: No app opens when you click the Camera Control.