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Crosshair

When enabled crosshair cursor is changed from default one to custom crosshair. (It's enabled by default.)

It's also changed while drawing:

How to control crosshair in DXcharts React​

Crosshair is enabled by default (cross-and-labels). To set it explicitly, pass initialChartConfig in ChartReactApp dependencies (see configuration API reference):

initialChartConfig: {
    components: {
        crossTool: {
            type: 'cross-and-labels', // 'only-labels' | 'none'
            xAxisLabelFormat: [{ format: 'dd.MM HH:mm' }],
        }
    }
}

Read more about CrossTool.