To sort the items in the Gantt chart based on a certain field (column), click on the field name in the column header. You can click again in the same column header to reverse the sort order.
You can apply a filter to the Gantt chart either by using hyperlinks in the textual description (see Viewing summaries and item descriptions), or by selecting the Filter option in the upper frame of the report window, and specifying the field and operator for the filter.
To remove a filter, use the links at the top of the description frame for example, if you have filtered a list of tasks to show only those in progress, you will see the following heading:
Project Tasks : In Progress