You have already made the necessary changes. The default highlightRangeMode is NoHighlightRange. At least that is what the documentation says:

Valid values for highlightRangeMode are:

ListView.ApplyRange - the view attempts to maintain the highlight within the range. However, the highlight can move outside of the range at the ends of the list or due to mouse interaction.

ListView.StrictlyEnforceRange - the highlight never moves outside of the range. The current item changes if a keyboard or mouse action would cause the highlight to move outside of the range.

ListView.NoHighlightRange - this is the default value.

These things are always changing, since QML is still in a relatively early stage of development. You could try setting the property to ListView.NoHighlightRange explicitly. Beyond that, I don't think there is anything more that can be done.

Be aware that by making these changes, there will not be any automatic grabbing of additional results, since this depends on the the currentIndex value, which does not change when the highlight range is not enforced.