There is a pop up "Action" with two possible values.
- Splitting to DeviceCMYK color space (extend missing colorants)
- Splitting to DeviceN color space (extend missing process colors)
It will open a list of all existing Check properties in your web browser. There you would (as in our example above) search for "Extract CMYK from DeviceN" which would then show you something like:
This lists the possible values for "action" which are "split_to_devicecmyk" and "split_to_devicen".