Line Chart zoom and new feature not working

I am running on an instance of appian cloud (version 19.1) and I am basically trying to reproduce the following use case, which is listed in official documentation:

https://docs.appian.com/suite/help/19.2/Line_Chart_Component.html#display-date-and-time-fields-in-a-line-chart

What I really need is the ability of automatic resizing of the line chart, with subsequent data expansion on area selection by the user, as you can see in the image below.

I copied all the necessary code from the documentation page, but the result is quite different: the scrollbar is created in any case, and there is no chance to activate the zoom feature. Am I missing something?

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