Use following expression as column condition and column will not print.
NVL (SUBSTR (:request, INSTR (:request, '_', -1) + 1),
'ASHISH') NOT IN ('XLS', 'CSV', 'HTMLD', 'EMAIL','XLSX')

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Use following expression as column condition and column will not print.
NVL (SUBSTR (:request, INSTR (:request, '_', -1) + 1),
'ASHISH') NOT IN ('XLS', 'CSV', 'HTMLD', 'EMAIL','XLSX')