I am building a custom camera UI. I would like the CameraPreview to be expanded so it fits the device width. This is the implementation and the result:

          return Column(
            mainAxisSize: MainAxisSize.max,
            children: [
              Expanded(
                  child: GestureDetector(
                onTapUp: (details) {
                  focusOnTap(details);
                },
                onScaleStart: (details) {
                  zoom = _scaleFactor;
                },
                onScaleUpdate: (details) {
                  if (currentCamera == widget.normalCamera) {
                    onZoomChange(details.scale);
                  }
                },
                child: Stack(
                  children: [
                    CameraPreview(cameraController),
                    // top banner
                    Positioned.fill(
                      ...
                    ),
                    // bottom banner
                    Positioned.fill(
                      ...
                    ),


                    // zoom selector
                    Positioned.fill(
                      ....
                    ),

                    // top actions
                    SafeArea(
                      ....
                    ),
                  ],
                ),
              )),

              // bottom actions
              GestureDetector(
                onHorizontalDragEnd: (details) {
                  cameraController.dispose();
                  widget.onSwipe(details);
                },
                child: Container(
                  ....
                ),
              ),

As you can see, on the right there is a black empty space. I would like it to be gone and the camera preview expanded to match the full width.