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Gets or sets whether the outline indicator is displayed in the outline column.
The outline indicator shows the expand or collapse state for hierarchical rows displayed in the outline column.
bool ShowIndicator { get; set; }
Property ShowIndicator As Boolean
worksheet.Range["A1:A3"].Value = new object[,] {{"Name"}, {"Node 1"}, {"Node 1.1"}};
worksheet.Range["A3"].IndentLevel = 1;
IOutlineColumn outlineColumn = worksheet.OutlineColumn;
outlineColumn.ColumnIndex = 0;
outlineColumn.ShowIndicator = true;
bool showIndicator = outlineColumn.ShowIndicator;