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You just need to adjust the cable both should be just above the top of the nozzle when open and both should be even although the inside top fins block the view of the right nozzle both are the same. so set them just like the one you can see in the picture.
The other measurement that is important is the opening size when neutral. This keeps the boat from drifting in neutral. I don't have it handy, but should be in your boats operating or service manual.