Scan Barcode - camera box size

I've got a project which uses the "Scan Barcode" action to scan QR codes. Operators have asked if the box on the camera input (where the code needs to appear in) can be increased in size to make it easier for them to scan the codes.

Are there any settings to change this box size?

IIUC, that box is provided by the mobile device OS, not by Ignition's mobile app. Ignition just asks the OS to do this. Look for device settings (mobile OS) that might affect this.