EPPlus Software

We build EPPlus 5, a .NET spreadsheet library on Nuget

[EPPlus Software @EpplusSoftware]

@khurram This is supported from v5.6:
pivotTable.ColumnFields[0].Items.Refresh();
pivotTable.ColumnFields[0].Items.ShowDetails(false);
...or...
pivotTable.ColumnFields[0].Items[0].ShowDetails = false;