Beginner question on identifying a supply zone

I have gone through the training videos a couple times, now I have TradingView on my laptop and phone and I am starting to practice identifying supply and demand zones.

I know it isn't always crystal clear, so in my screen shot, the yellow arrow indicates price closing below Fractal Low#2, and it is also the first time price closes below Fractal Low#1. What is the best candle to place the Supply Zone for this new swing low where the yellow arrow is? I am thinking it is Supply Zone#1 - any thoughts one way or the other?

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