Trying to apply LayoutMirroring property on Slider, but it is not working

[Veeresh Veer]

import QtQuick.Window 2.15
import QtQuick 2.0
import QtQuick.Controls.Styles 1.4
import QtQuick.Controls 2.3
import QtQuick 2.14
import QtQuick.Controls 1.4 as QQC1
import QtQuick.Controls 2.14 as QQC2
import QtQuick.Layouts 1.3
Window {
id:_root
width: 640
height: 480
visible: true
title: qsTr("Hello World")
LayoutMirroring.enabled: true
LayoutMirroring.childrenInherit: true
QQC1.Slider {
id:new_slider
Layout.alignment: Qt.AlignVCenter
maximumValue: 400
minimumValue: 0
value: 0
stepSize:1
style: SliderStyle {
groove: Rectangle {
implicitWidth: 200
implicitHeight: 8
color: "grey"
radius: 8
}
handle: Rectangle {
anchors.centerIn: parent
color:"#3498DB"
implicitWidth: 55//95
implicitHeight: 55//95
radius: implicitHeight/2
}
}
}

}