The behavior is designed such that zooming is limited upto a certain region, so the user doesn’t end up zooming into a blank-region (region with no dataPoints). To zoom into a certain region, there should be around 4 dataPoints. In your case, zoomType: ‘x’ should work fine as zoomType: ‘y’ / ‘xy’ would be limited to just 3 dataPoints with different values over the y-axis. Please take a look at this documentation page for information on zoomType option.
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Indranil Deo
Team CanvasJS
