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

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# rangeSelector.buttons.preserveDataGrouping

When buttons apply dataGrouping on a series, by default zooming in/out will deselect buttons and unset dataGrouping. Enable this option to keep buttons selected when extremes change.