Splitter not visible in Splitview within StackLayout

[SietseAchterop]

Hello list,

My app is an ApplicationWindow with a StackLayout as its main content.
One of the sub-pages is a Splitview.
That sub-page is correct and visible, but there is NO splitter visible of usable!

Here the simplified main.qml

import QtQuick 2.13
import QtQuick.Controls 2.13
import QtQuick.Layouts 1.12

ApplicationWindow {
    id: applicationWindow
    visible: true
    width: 400
    height: 400
    
    StackLayout {
        id: stackLayout
	width: parent.width
	currentIndex: tabBar.currentIndex
	Pieces {
            id: iets1
	}
	ViewPiece {
            id: iets2
	}
    }

    footer: TabBar {
        id: tabBar
        currentIndex: stackLayout.currentIndex
        TabButton {
            id: tabButton
	    implicitHeight:20
            text: qsTr("Setup pieces")
        }
        TabButton {
            id: tabButton1
	    implicitHeight:20
            text: qsTr("View piece")
        }
    }
}

And Pieces.qml

import QtQuick 2.13
import QtQuick.Controls 2.13
import QtQuick.Layouts 1.12

Item {
    SplitView {
        id: splitView
        anchors.fill: parent

	Text {
	    text: 'Pieces links'
	    SplitView.preferredWidth: 200
	}
	Text {
	text: 'Pieces rechts'
	}
    }
}

If i change Pieces.qml into a visible ApplicationWindow and use it as the main qml-file it works!

This is on Linux/Debian/Buster.
What am I doing wrong? Thanks in advance.
Regards, Sietse

[IntruderExcluder]

Your StackLayout have zero height, thats why it doesnt shows anything.

[SietseAchterop]

@IntruderExcluder Thanks!