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You can reset the axis range programmatically by setting viewportMinimum & viewportMaximum to null. Please refer to the code-snippet below which shows how to reset the axis range on button click.

document.getElementById("resetChart").addEventListener("click", function() {
  chart.axisX[0].set("viewportMinimum", null, false);
  chart.axisX[0].set("viewportMaximum", null);

Please take a look at this JSFiddle for complete code.
Reset Axis Range Programmatically

Vishwas R
Team CanvasJS