import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Layouts 1.12
import QtQuick.Controls 2.12

Window {
    id: root

    width: 250
    height: 150
    visible: true
    title: qsTr("Hello World")

    Column
    {
        id: monitoring

        LayoutMirroring.enabled: true
        LayoutMirroring.childrenInherit: true

        CheckBox
        {
            id: myCheckBox
            text: "check box"
            checked: true
            anchors.left: parent.left // CULPRIT #1
        }

        Row
        {
            id: torrentFolderSettings

            x: myCheckBox.x + 20
            width: root.width - x // CULPRIT #2. REPLACE root.width with parent.width to avoid the issue

            TextField
            {
                id: torrentFolder
                readOnly: true
                Layout.fillWidth: true
                text: "some text"
            }
        }
    }
}