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The appropriate zoom type of the combination chart is zoomType = "horizontal".

The <CrossRangeZoomer> element tag is used to add the zoom feature to the chart, and it must be defined as a child node of the <annotationElements> element tag which is a child node of the chart tags, such as <Line2DChart>, <Column2DChart>, etc.

...
<Combination2DChart ... >
'''
  <annotationElements>
    <CrossRangeZoomer zoomType="horizontal" horizontalLabelFormatter="{numFmt}" enableZooming="true" enableCrossHair="false">
    </CrossRangeZoomer>
  </annotationElements>
</Combination2DChart>
...
zoomType The zoomType attribute controls which axis can be zoomed in and out. The valid values are "horizontal", "vertical", "both", and the default value is "both".
horizontalLabelFormatter The horizontalLabelFormatter attribute is used to set formatter for the label displayed at the horizontal crosshair line.
enableZooming The enableZooming attribute determines whether or not to use the zoom feature. The default value is "true".
enableCrossHair The enableCrossHair attribute determines whether or not to use crosshair.

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