In the context of the multiple-based valuation methods, the green dot represents the mid-point of the valuation. It is typically based on the peer group's median (represented by the blue range), unless you have entered a discount or a premium on the Peers and/or Transactions screen.
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The green vertical line in the middle of the fading range represents the peer group's median. If the green dot sits to the left of the line, or the left of the range, it means you have a Discount to a median of the trading or transaction multiples. This can be a system default based on the Qualitative Assessment, or you can manually override the Discount.
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In case you had applied a Premium, this green dot would have been to the right of the Range.