Does the Rowing Machine at the Gym make legs/thighs smaller?

I would like to know what the rowing machine at the gym is good for. Basically I want to lose a few kg and tone up and slim down my thighs.
Im really scared of gaining too much muscle and I dont want them to get bigger...just tone down.
Is the rowing machine good for this?
Does the Rowing Machine at the Gym make legs/thighs smaller?
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