do not want duplicate screens on two monitors

Hello, I have been using plugable products for 3 years now. I was using a laptop plus 4 additional monitors. Where I could have different pages on all 5 screens. Now I have added a fifth monitor to my system and I have having a duplicate screen on the laptop and one of the monitors. I have played around with the settings and cannot figure it out. I do not want a duplicate page on two monitors. Please advise