Conversely, if the dataset contains any value between 0 and 999, the axis starts from 0.
This is expected behavior. OmniStudio FlexCard's chart element uses dynamic axis scaling — the Y-axis baseline is automatically set to the minimum value present in the data range. This is a standard charting convention designed to improve visual clarity by zooming in on the relevant portion of the data range.
There is currently no built-in configuration option on the FlexCard chart element to force the Y-axis to always start from 0.
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