# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# navigator.series.dataGrouping.groupAll

By default only points within the visible range are grouped. Enabling this option will force data grouping to calculate all grouped points for a given dataset. That option prevents for example a column series from calculating a grouped point partially. The effect is similar to Series.getExtremesFromAll but does not affect yAxis extremes.