Hi Samantha,
We suggest removing the whitespace around the pie chart by
setting the margin to 0 for the left, right, top, and bottom. Additionally,
please note that the default radius is 80%, but we recommend setting it to 100%
to achieve your desired scenario. We have attached a sample and a screenshot
for your reference. Please review the provided code snippet.
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<SfAccumulationChart Width="100%" Height="100%">
<AccumulationChartSeriesCollection>
<AccumulationChartSeries DataSource="@StatisticsDetails"
XName="Browser" YName="Users"
Name="Browser"
Radius="100%">
</AccumulationChartSeries>
</AccumulationChartSeriesCollection>
<AccumulationChartMargin
Left="0" Right="0" Top="0"
Bottom="0"></AccumulationChartMargin>
<AccumulationChartLegendSettings
Visible="true"></AccumulationChartLegendSettings>
</SfAccumulationChart>
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Sample: https://blazorplayground.syncfusion.com/hNBzNiLeTLwuxwnw
Screenshot:

Kindly revert us if you have any concerns.
Regards,
Gopalakrishnan
Veeraraghavan