I create a TextField like this:

TextField {

    id: root 

    // Set size

    width: global.standardItemWidth

    height: global.standardItemHeight

    focus: true     

    inputMethodHints: Qt.ImhNoAutoUppercase|Qt.ImhNoTextHandles

According to documentation:

"Qt::ImhNoTextHandles0x1000Do not use built-in text cursor and selection handles. This flag was introduced in Qt 5.11."

The build-in text cursor and selection handles shouldn't be used but they are. See attached image.