How do I turn of the automatic synchnonization of class diagrams?
For example, I have diagram 1 and I copied the contents into diagram 2. I want to remove an attribute or operation from diagram 2 without it automatically removing it from diagram 1 as well.
This is controlled by how you create the class model in diagram 2. By default, copy and paste, or drag from model tree to diagram will result in creating a new shape that share the same source model. If you want to create a new model from the source, you have to paste as model. To do this, copy the source element, right-click on diagram and select Paste Model from the popup menu.