Hiding folder tabs in the documentation

The Dopus help file that I have says:

... a Preferences setting lets you hide the tabs until they are needed ...

Looking through the Preferences menu and using "hide" as the filter, however, does not turn up a specific place to do this.

Can anyone specify where in the preferences a DOpus user can choose to hide folder tabs?

TIA.

The settings are under Preferences - Listers - Folder Tabs.