Hi, Edinson -
I've only played with the ECharts sample program a little, but I believe this is related to the "width" and "height" attributes specified in the "Division" tag:
![](data:image/png;base64,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)
Others are welcome (please!) to chime in with more complete and/or better information, but I believe this relates to the display area in the web browser control. In the above example, I've specified the height to be 800%... 800% of what, I've not a clue, but this value affects the height of the displayed chart in the browser.
I suggest you experiment with the width/height percentages to see if you can determine the values that give you the behavior you are looking for.
Best regards, John