@reactdeveloper,
To zoom into a certain region, there should be a minimum of 3-4 dataPoints – 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). It is not possible to change the restriction as of now. But we will reconsider this behavior for future versions.
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Adithya Menon
Team CanvasJS