In the attached image, what do the 3 states of this button in the red rectangle mean?

I haven't worked with Illustrator for a long time and forgot what the function of this button is, I searched a lot and found that it's called the target button and is used to move all the content of a layer into in new layer, but still can't get the difference between these 3 shapes.

enter image description here?

  • Thank you so much! – Sara Jul 26 at 13:46

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