In order to use this feature, please refer to the following instructions in iDocs6, “Using iDocs6 for this feature with following configuration”
When at the step involving “Select the spool page” window, there is an interface for entering “Page per overlay”:
The status bar shows how many pages per overlay:
Multiple spooled pages will be shown at the same time in the right pane if the “Page per Overlay” entry is greater than one.