# 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.

# chart.zooming.mouseWheel.sensitivity

Adjust the sensitivity of the zoom. Sensitivity of mouse wheel or trackpad scrolling. `1` is no sensitivity, while with `2`, one mouse wheel delta will zoom in `50%`.