Dual camera in s7 edge

there is no solution for that. cause the main purpose of that feature is to let the person take a photo of his self while taking a picture of the main subject which will be taken using the main camera. but if you want to make your photo larger than image that will be taken from main camera simply touch the smaller window of the camera from the screen so the camera display will be inverted. the front camera will be larger than the back camera.

dual camera don't load