About Workbook Themes
A workbook theme defines the default style settings that are applied when you create a workbook and its visualizations. You can configure a workbook theme to change various theme style settings for example, color palette, font family, or background color. You can change any of these theme settings to alter the appearance of a workbook and its visualizations.
Topics:
You must have the permissions, Manage Layouts and Themes, and Create and Edit Shared Themes to create and update workbook themes.