I have a highstock chart which hosts a stacked column + a spline line . I have some issues with the preview shown at the bottom : it is neither for the stacked column nor for the spline line , and I want to set it to one of these (preferably the stacked column ) . From what I am guessing, the highstock renders a preview for a combination of them, but i am not sure. Please help!

I have a highstock chart which hosts a stacked column + a spline line
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navigator: {
baseSeries: ‘spline’,
height: 35
},
‘spline’ is the ID of the series i want to render in the preview