When fullScreenMode is set with a Binding:

    Binding {
        target: VirtualKeyboardSettings
        property: "fullScreenMode"
        value: true
    }

In fullscreen mode, the virtual keyboard should replicate the contents of the focused input field to the fullscreen input field located at the top of the keyboard.

This does not work, but if you use the following method instead it works.

     Component.onCompleted: {
        VirtualKeyboardSettings.fullScreenMode = true
     } 

To reproduce, please run the attached example.