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Break also has the attribute hideValueLabel. Default is false, if it is set to true, labels of values that fall into this classbreak will not be displayed. See example bellowbelow. This is available since 2020.01.
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If label is configured in a classbreak, the legend will show the label in the table instead of the values. When a mouse is hovering over a point, the tooltip will show the configured value if there is no label, and the label plus the value if there is a label (since 2018.02.). Notice in the example bellow below that one of the breaks has no label.
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