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This is default behavior of the CategoryDateTimeAxis, all ranges are clipped not to be less than zero or current VisibleRange. You should implement your own behavior, for example, custom modifier which inherits the ZoomPanModifier and add the historical data there if the VisibleRange after panning is the same as before.
Or maybe a better choice is to have the historical data initially added, and just set the initial VisibleRange to appropriate value (so you won’t see it until you pan the chart backward)?
Is any of this workarounds suitable for you?
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