Do you not have a fridge freezer at home with two controls or a car with dual temp zones. Same deal with the fridge.
It the compressor only compresses the refrigerant, it doesn't care where it ends up or how it gets back. That is all done by valves and thermostats downstream. It merely means that the refrigerant goes to the evaporators or plates until the thermostat in that zone reaches the required temperature and then shuts off the respective valve and refrigerant no longer flows to that section. If both sections are at or below the various settings, the compressor turns off also.
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