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TrueSight Capacity Optimization
The issue has been tracked under DRCOZ-20786 and the fix will be included in CHF18 for CO 11.3.01.
Until these updates have been done you can turn off labels for Pie chart to workaround the problem for now, and also for scenarios that have large number of slices.: in Edit the page, click on Chart settings ->Change chart labels - and Uncheck checkbox it will disable labels in pie chart.