QML scrollbar display issue

[JoeCFD]

I added a scrollbar to qml listview. It shows up only when I pressed it. After its visible is set to true, I still have the same problem.
I changed its z value as well. No help. What is the problem? Qt 5.15.2 + Ubuntu 18.04

        ScrollBar.vertical: ScrollBar {
            anchors.right: parent.right
            z: 10
            visible: true
        }

[JoeCFD]

No one else has the same issue?

[JoeCFD]

fixed from the link here: https://stackoverflow.com/questions/69006668/flickable-scrollview-in-qml-with-always-visible-scrollbars-that-dont-overlap