How to disable the Title and Subtitle in Highcharts?

To disable the title and subtitle in Highcharts, set them to an empty string or use text: null in the chart configuration to prevent them from being displayed.

Example Code:

javascript
Highcharts.chart('container', {
    chart: {
        type: 'line'
    },
    title: {
        text: null  // Disable main title
    },
    subtitle: {
        text: null  // Disable subtitle
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
            'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    yAxis: {
        title: {
            text: 'Temperature (°C)'
        }
    },
    plotOptions: {
        line: {
            dataLabels: {
                enabled: true
            },
            enableMouseTracking: false
        }
    },
    series: [{
        name: 'Tokyo',
        data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
    }, {
        name: 'London',
        data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
    }]
});

In this example, setting the text property of both title and subtitle to null ensures these elements are not displayed in the chart, effectively disabling them. This approach makes the chart appear cleaner, especially when the title does not provide additional information or when sufficient description is already available elsewhere on the page.