Hi vetrivel!
We appreciate you reaching out to us!
There is a flag
allowOverlap which decides whether to show all the data labels or not. By default, that flag is set to
false which means show labels for some of the bars which have enough space to accommodate the label, for other bars the number is hidden. When we set the flag to
true, it shows labels for all the bars irrespective of whether there is enough space or not.
Demo: https://jsfiddle.net/BlackLabel/vcL9as8g/
API Reference: https://api.highcharts.com/highcharts/s ... lowOverlap
Let me know if you have any further questions.
Best regards!