Do you find the 3D Viewer feature in Windows 10 unnecessary and want to stop it from running? Here's how you can do it in a few simple steps. First, go to the Start menu and open the Settings app. Then, click on Apps and find 3D Viewer in the list of installed apps. Click on it and select Uninstall to remove it from your system. If you prefer to disable it rather than uninstall, you can also right-click on the Start menu, choose Windows PowerShell (Admin), and type in 'Get-AppxPackage *3dviewer* | Remove-AppxPackage' to disable it. With these steps, you can easily stop 3D Viewer from running on your Windows 10 system.