See attached image.

Removing is done using code:

    protected class RemoveSeriesNode extends TestNode {
        public RemoveSeriesNode() {
        }
        @Override
        public Node drawNode() {
            final XYChart chart = (XYChart)createObject();
            Platform.runLater(new Runnable() {
                public void run() {
                    int counter = 1;
                    while (counter < chart.getData().size()) {
                        chart.getData().remove(counter++);
                    }
                }
            });
            return chart;
        }
    }