# 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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# rangeSelector.buttons.dataGrouping.anchor

Specifies how the points should be located on the X axis inside the group. Points that are extremes can be set separately. Available options:

- `start` places the point at the beginning of the group (e.g. range 00:00:00 - 23:59:59 -> 00:00:00)

- `middle` places the point in the middle of the group (e.g. range 00:00:00 - 23:59:59 -> 12:00:00)

- `end` places the point at the end of the group (e.g. range 00:00:00 - 23:59:59 -> 23:59:59)