You can hide a legend item using the “legendItem object and set the visible  property within each series item to false.

series: [
    {
        values: [15],
        legendItem: {
            visible: false
        }
    },
    {
        values: [10]
    },
    ...
]

Example: https://demos.zingchart.com/view/D20I8VNS

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