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In DEX you can add graphical arcs. In schematics they have no electrical significance. However, in PCBs they have significance if they are placed on electrical layers such as the top or bottom layer; here they will leave copper traces and will provide an electrical connection to everything that is connected to them.
Arcs have a width that can be zero for an infinitely thin arc. However, if you add arcs to a PCB you need to make sure their width is at least the size of the manufacturing minimum width.
Arcs also have color and can be semi-transparent. It is even possible to define an invisible arc. If you have snap to objects enabled, objects will snap to invisible arcs.
Arcs can also have a line style as shown below.