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How to remove specific borders – can't find it in the documentation
Rectangle{ width: 300 height: 300 color: "#21457e" border.color: "#ff0000" }
Set the color to "transparent" or the width to 0.
"transparent"
@DeSGuN Do you mean the border on only certain sides of the rectangle? I don't think there is a built in way to do this. You might be able to overlay thin rectangles to cover the borders perhaps, but I am not sure how well it will work.