As the Screen recording shows, I cannot change color in part of the instance, not matter if it’s linked to a variable, or detached. It can only be changed via its master component.
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Color in part of instance is not controllable
Best answer by Raphael_M
You need to re-union(merge) the path because there are 2 paths on your current vector file.

Current vector has 2 paths:

After union it will be merged into 1 path:

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