Stefan All is clear now, and I thank you very much for your valued contribution. I failed to understand what you were providing was the means to do what my original message stated could not be done, regarding the colour of the polylines not changing when I edited the hexadecimal code in Value. I had to change the existing Key from “color” to “colour”, only. I have yet to learn how to select the polylines alone. “Select all” selects the nodes, invisible initially, but present, too.
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