Hi Anthony,
Thanks for using Syncfusion products.
We suggest you to use "labelRotation" property of primaryXAxis to rotate x-axis labels.
Please refer the following code snippet to achieve this.
<code>
[JS]
primaryXAxis:
{
title: { text: 'Countries' },
labelRotation: 90,
},
</code>
We have created a simple sample for rotating labels of x-axis and it can be downloaded from the following link.
LabelRotationJS.zipPlease let us know if you have any concern.
Regards,
Anand