Is it possible to change appearance for Composite line?
(different color or dotted…)
I couldn’t find the field when I was looking for it on"get info". 
Sorry, what do you mean by this?
If difficult to describe even a screen grab might help us zero in on the right thing.
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Not at present.
Is the issue that the composite border is hard to see in your case? (A screen shot might help, here)
Or do you want to visualize some property of the composite by changing the composite border?
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I mean composite border! sorry my poor explain.
It is not a big problem. I just thought it would be nice to have a border with a dots or another color or something to make it more crisp when there are more Composite. 
FWIW, the outer, bounding, border of a composite cannot be styled. In part I suspect as there isn’t a composite object properties/dialog where such styling might be applied.
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