Once a theme is configured, it can be applied to a form. To apply a theme to a form:
With a form open in the Designer, select the Form Properties tab in the Properties pane.
Select a theme from the Theme from the drop-down list. Alternatively, you can click the corresponding edit button to launch the Theme Designer and edit the selected theme.
System themes cannot be edited. Only user-configured themes can be edited. Preset themes have names followed with (System). These system-defined themes cannot be edited, but can be duplicated to create a user-configured theme that is based on the preset theme. For more information about creating themes, see Theme Designer.