Why 15' Macbook Pro with Retina Display Shows 4K Resolution?

I discover a very interesting problem when taking a screen capture in 15 inch Macbook Pro with Retina display under different screen resolution settings.
Please see the image below first.
Info on the Left : Screen captured in "Default" setting, which is the best retina setting, everything is huge and very Sharpe.
Info on the Right: Screen captured under the "More Space" setting, which everything looks small and give more space.
The problem is the screen captured file pixel resolution in each screen resolution settings:
The "Default" screen setting showing the correct pixels at 2880 by 1800 which is perfect.
The "More Space" setting is showing 3480 by 2400, at 4K resolution.
My question is:
Why is that when the display is under "More space" setting result with more pixels?
Can anyone help me to explain this with this please?

I'm not sure what is to explain. "More space" works by pretending that there are more pixels available on the screen than the physical screen has, so it's not too surprising that a screen shot should have more pixels.

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Why 15' Macbook Pro with Retina Display Shows 4K Resolution?

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