Hi Matthew,
To customize the orientation of Chart point's text, use the below code
series1.Style.Font.Orientation = 270; // Customizing all the points orientation
series1.Styles[index].Font.Orientation = 270; // Customizing individual points orientation
Please refer the below documentation links for more details on Text customization.
http://help.syncfusion.com/ug_73/chartwin/DisplayText.htmlhttp://help.syncfusion.com/ug_73/chartwin/TextOffset.htmlhttp://help.syncfusion.com/ug_73/chartwin/TextOrientation.htmlhttp://help.syncfusion.com/ug_73/chartwin/SmartLabels.htmlChart Documentation Link:
http://help.syncfusion.com/ug_73/chartwin/default.htmlThank you for your interest in Syncfusion products.
Regards,
Venkat.