A stacked column chart stacks each category's parts into a single column, showing the total height and the contribution of each part at once.
Series with the same StackGroup stack on top of each other. Every distinct group and every RadzenColumnSeries gets its own column next to the others.
When categories break into parts that sum to a meaningful total - sales by region within each quarter - and you want totals and composition together.
Stack when the total matters and the parts add up to it; group them side by side when you mainly want to compare the parts.
Yes. Set StackGroup on the stacked series - series with the same group stack together and every group renders as its own column. RadzenColumnSeries in the same chart gets its own column too.
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