Spread.Services provides users with a set of built-in themes to enable them to change the overall appearance of the workbook. Besides, it also allows users to create custom theme and apply it in order to set up a workbook as per their own preferences and requirements.

When a theme is changed, it affects all areas including the theme font, theme color, range, chart title etc. For instance: if you apply a built-in or a custom theme to your workbook, it is likely that the color of the range as well as the font will also be changed in accordance to the modified theme.

For more information on Themes, please refer to Apply Theme in this documentation.