Hello,
Have you try these steps.
- Pin a program to your taskbar.
- Open up Start11 Configuration.
- Turn on Enhance taskbar if it is not already turned on.
- Click on "Configure enhanced taskbar"
- Go to "Pinned taskbar shortcuts control" click on that down arrow to open pinned shortcut list.
- Get to your which ever pinned program that you wish to appear on your secondary taskbar. Click on it.
- Select "Secondary display only".

Thank you,
Basj,
Stardock Community Assistant.