It seems like it is not possible to duplicate a diagram that has already been laid out. So in my case I have a complex set of tables with a large number of relationships and I want to have different diagrams with the same layout of the tables but with different aspects visible, for example a version of the diagram that shows only Tables & Summary, then another versions that shows columns, etc. Yes you can toggle this, but it also nice to have separate diagrams that look very similar but are also graphically organized differently. For example the Table/Description version might have additional notes, whereas the full column version would not.
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