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I have a complicated project and I would like to group the circuits by type in the project pane
so that they are neatly organized. The Calc16 example groups its circuits, but I cannot work out how to do it. How is it done?

On the properties of the circuit you have "Category" field. Use it for grouping.
For more information on features please look at the help pages: https://logiccircuit.org/help.html