Replied 14 January 2021, 6:49 pm EST
If I understand correctly, your issue is that when you set the y-axis of the series, then stacking is not performed. Stacking is only done when the [axisY] property is set to null.
The bug report that I created (#470363) refers to this issue. That is why I said in my previous reply that I have already passed this information to the developers.
Now, if you wish to customize the default y-axis, then try using the following code snippet:
<wj-flex-chart-axis [wjProperty]="'axisY'" title="Main Axis" ....></wj-flex-chart-axis>
Notice the wjProperty input. This property tells that FlexChart that this axis should be used as the axisY property of the FlexChart.
I hope this helps. But, if this is not the issue you are facing. please let me know.