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In DEX you can add graphical notes. 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.

Notes have a width that can be zero for an infinitely thin line. However if you add lines to a PCB you need to make sure their width is at least the size of the manufacturing minimum width.

Notes also have color and can be semi-transparent. It is even possible to define an invisible note. If you have snap to objects enabled, objects will snap to invisible notes.