The list of available driver help templates is listed here.
This list includes the template defined within the driver help project, help templates installed by Nimbus, and any custom driver help templates you may have created. The choices shown will correspond to the templates present in the HelpTemplates subfolder of the Nimbus installation folder.
A preview of the selected template is displayed below. Changing the selected help template has no effect on the help project until you press the Switch to this template button.