outlineThickness: Number

Sets the outline thickness of Slider in pixels.

Default: 1
Example: 2,5, … 
var stockChart = new CanvasJS.StockChart("container",
{
  .
  .
  navigator: {
    .
    .
    slider: {
      outlineThickness: 2
    },
    .
    .
  }
  .
  .
});
stockChart.render();
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