I curently have a problem about how to display one of multiple screens on "x display".

I have three screens which include 2 standard display and a "x display".

The diagram is below.

I have the redhawk linux pc and the three screens are connected with the pc.

I wrote down tree screens contents on main.qml like:

import QtQuick 2.3
import QtQuick.Controls 2.3
import QtQuick.Window 2.1
import "MainDisp"
import "CameraImgDisp"
import "TouchPanel"

import ViewMain 1.0

QtObject{

property ViewMain viewmain: ViewMain {

    property Window mainDispWindow: MainDispWindow{
        id:mainDispWindow
        x:1920
        y:0
    }

    property Window CameraImgDispWindow: CameraImgDispWindow {
        id:cameraImgDispWindow
        x:1920
        y:0
    }

    property Window touchPanelWindow: TouchPanelWindow {
        id:touchPanelWindow
        x:0
        y:0
    }
}

}

What I try is :

・to configure property"Qt.application.screens[x]". But I could not get a infomation about x display and
could not display only xserver.
https://doc.qt.io/qt-5.12/qtquick-window-allscreens-qml.html

・to configure "Display =tp11.0.0 ./project_name "on my linux terminal. But I displayed three screens on only x display.
I mean I could not display on the other screens.

If you know how to solve my problem , could you tell me that ??