Thanks for your posting and using Aspose.Cells.
Please set the ListObject.AutoFilter.Range to null, then it will disable the autofilter on your table.
Please see the following sample code. I have attached the source excel file used in this code and the output excel file generated by it for your reference.
string filePath = @“D:\Downloads\source.xlsx”;
Workbook workbook = new Workbook(filePath);
Worksheet worksheet = workbook.Worksheets;
ListObject lobj = worksheet.ListObjects;
lobj.AutoFilter.Range = null;