How do you group circuits neatly in the project pane?

[MarioGianota]

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?

[admin]

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