Install If You Want to Use DeX for PC
Samsung’s DeX for PC solution supports Galaxy Note 9 running Android 10.
DeX for PC, a feature that rolled out alongside the Galaxy Note 10, allows you to connect your phone to a Windows computer or a Mac and use it in a desktop environment. You only need a USB cable.
This is perfect for those of you who like getting work done or playing mobile games with a mouse and keyboard.
You can download DeX for PC for Windows or Mac from Samsung's website.