Background application is not receiving focus on hiding my Qt Quick application in macOS

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Hi,

I have an application like Spotlight Search on macOS. On pressing the escape key, I want to hide this application and set the focus to the background application just like Spotlight Search. The application is getting hidden, but the background application is not receiving focus. What am I doing wrong?

main.qml Code:

import QtQuick 2.9
import QtQuick.Window 2.2

import "qrc:/ApplicationContainer/qml"
import "qrc:/SearchBoxWidget/js/SearchBoxWidget.js" as SearchBox

Window {
    readonly property int shadowWidth: 10

    id: root
    visible: false
    flags: Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint

    width: container.width + 2 * shadowWidth
    height: container.height + 2 * shadowWidth
    x: Screen.width/2 - width/2
    y: Screen.height/7

    color: "transparent"

    onActiveChanged: {
        if(!active && visible) {
            SearchBox.dismissApp()
        }
    }

    ApplicationContainer {
        id: container

        width: 640
        height: childrenRect.height
        x: parent.x + shadowWidth
        y: parent.y + shadowWidth
    }
}

ApplicationContainer.js

import QtQuick 2.12
import QtGraphicalEffects 1.12
import QtQuick.Controls 2.12

import "qrc:/SearchBoxWidget/js/SearchBoxWidget.js" as SearchBox

Rectangle {
    radius: 10

    layer.enabled: true
    layer.effect: Glow {
        cached: true
        radius: 15
        spread: 0.2
        samples: (2 * radius) + 1
        color: Theme.defaultColor.layer
        transparentBorder: true
    }
   
    /* here search box code*/

    Keys.onEscapePressed: {
        SearchBox.dismissApp()
    }
}

SearchBoxWidget.js

function dismissApp() {
    root.hide();
}

Any help will be highly appreciated.