Demo of xAxis.title.text and align

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/stock.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>

<script src="https://cdn.jsdelivr.net/npm/@highcharts/controls@0.8.0" type="module"></script>

<figure class="highcharts-figure">
  <div id="container"></div>
</figure>

<div class="highcharts-controls-wrapper">
  <highcharts-controls>
    <highcharts-group header="Update options">
      <highcharts-control type="text" path="xAxis.title.text" value="This is the x-axis text"></highcharts-control>
      <highcharts-control type="select" path="xAxis.title.align" value="middle" options="low,middle,high"></highcharts-control>
    </highcharts-group>
  </highcharts-controls>
</div>

CSS

* {
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        "Apple Color Emoji",
        "Segoe UI Emoji",
        "Segoe UI Symbol",
        sans-serif;
}

.highcharts-figure {
    max-width: 800px;
    margin: 1em auto;
}

.highcharts-controls-wrapper {
    max-width: 800px;
    margin: 1em auto;
    padding: 0 10px;
}

highcharts-controls {
    display: inline-block;
}

TypeScript

(async () => {

    const data = await fetch(
        'https://www.highcharts.com/samples/data/usdeur.json'
    ).then(response => response.json());

    Highcharts.stockChart('container', {
        title: {
            text: 'Demo of <em>xAxis.title.text</em> and <em>align</em>'
        },
        xAxis: {
            title: {
                align: 'middle',
                text: 'This is the x-axis text'
            }
        },
        series: [{
            data: data
        }]
    });

})();