Quicklaunch provide its own taskbar in Lockdown mode. This can be shown or hidden using the provided instructions.
1. In Quicklaunch Setting <Ctrl-Alt-S> -> System On the Right Side under options - Disable Lockdown mode.
2. In windows set taskbar to automatically hide to On
3. In Quicklaunch Setting <Ctrl-Alt-S> -> System On the Right Side under options - Enable Lockdown mode.
4. The taskbar should no longer be presented when you are presenting the Quicklaunch Screen.