Hi Karen,
Windows 10 has a feature that allows wireless transmission of media content from a PC or any other compatible devices by casting it on a television. If your computer and smart television are compatible with each other, it will be easier to connect them since they are “plug and play ready” and can be connected directly. If not, you will only be able to connect it via cable.
To have a better grip on your concerns with multiple/extended displays, we’d like to know the following:
- Which version or build of Windows device are you using? To know, press Windows + R to open the Run window. Type winverand press Enter. A new window will open showing the version and build number of your Windows device.
- What type of connection do you prefer? Through cable (HDMI, VGA or DisplayPort) or wireless casting (Miracast, Roku, etc.)?
- What is the speed of your Internet connection? You can test it here: www.speedtest.net.
- What is the exact make and model of your computer?
- What is the exact brand and model of your television?
- Do you have a dongle that allows your computer for casting or screen mirroring (for wireless connection)?
- Do you have a cable/port? (For example, HDMI, VGA or DisplayPort).
- What are the workarounds did you try so far?
- What is the range between your TV and the computer?
In addition, we’d like to check if you already tried using the Project in the Action Center? You can do this by pressing Windows + P. The Project allows casting of multimedia contents from a computer to a television.
Make sure that you set your casting settings to DuplicateorSecond screen only.
Otherwise, you will need to use an HDMI cable (wired connection) to connect your computer to a TV if they’re not compatible with broadcasting in wireless mode.
In addition, you can visit this link: Troubleshooting Wireless Display Adapters for more troubleshooting steps regarding wireless displays.
Get back to us once if you can provide us additional information.