A:Answer We are sorry to hear that you are having difficulty extending your Lenovo Laptop screen to this Lenovo L15 USB-c Portable Monitor. If you can see the laptop screen on the L15 USB-c monitor, your monitor is performing properly, you just need to change your display settings from Duplicate to extend your monitor view. Here is a link to more information about selecting to extend your laptop screen view to an external monitor like this Lenovo L15 USB-c Portable Monitor: https://answers.microsoft.com/en-us/windows/forum/all/how-to-add-and-use-a-second-monitor-in-windows-11/527d487a-f124-4254-892d-177b08d90e1e#:~:text=Launch%20the%20Settings%20app%2C%20click,Click%20Extend%20these%20displays.&text=After%20extending%20your%20monitor%2C%20you,for%20working%20with%20multiple%20monitors. If you continue to have issues we recommend you contact Lenovo tech Support for Monitors for additional help at: 866-426-0911.