What you can try is to target the series generated by the ChartSeriesProvider. For example, you can set it through the Style property.
<Setter Property="StrokeThickness" Value="4" />
<Setter Property="ZIndex" Value="0" />
Another approach is to subscribe to the SeriesCreated event of the ChartSeriesProvider. In the event handler, you can get the currently created series from the Series property from the event arguments and set the ZIndex property.
I hope this information is useful.
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