I am using apex_data_export.add_column as below. The problem is, no matter which column I put the p_is_frozen flag in, it always freezes just the first column in Excel. If I exclude p_is_frozen, then no column is frozen, but when I include it, it always freezes the first column.
apex_data_export.add_column(p_columns => lt_columns, p_name => 'NODE_CODE', p_heading => 'Node Code');
apex_data_export.add_column(p_columns => lt_columns, p_name => 'NODE_NAME', p_heading => 'Node Name');
apex_data_export.add_column(p_columns => lt_columns, p_name => 'SYSTEM_NAME', p_heading => 'Source System Name');
apex_data_export.add_column(p_columns => lt_columns, p_name => 'POSTABLE_FLAG', p_heading => 'Postable Flag');
apex_data_export.add_column(p_columns => lt_columns, p_name => 'ACTIVE_FLAG', p_heading => 'Active Flag', p_is_frozen => TRUE);