Access the Settings by right-clicking the Zoom Icon in the Taskbar.
Within the Video Menu, select AtomX CAST from the dropdown as your camera.
Next, tick the Original ratio and HD checkboxes. Here, you can also choose if you want to mirror your video.
If you plan on using your CAST’s audio in your call, go to the Audio Tab and select AtomX CAST in the Microphone dropdown.
We also recommend disabling the Automatically adjust microphone volume option.