What is "Make Unique"?

Similar question: How to unassociate a material from a model?

Operation

If you need to unassociate a material from a model that was created by the "Associative Duplicate" operation, click on "Make Unique" in the right sidebar to unassociate it.

FAQ

Q: Does the unassociated model can be re-association??

"Make Unique" supports undo, but not supports of the re-association.