You can hide it by placing a condition on a column of type PL / SQL Expression and using the following expression as an expression:
NVL(:REQUEST,'EMPTY') NOT IN('CSV','XLS','PDF','XML','RTF','HTMLD')
This will check the APEX "REQUEST" binding variable, and if it is CSV, XLS, PDF, XML, RTF or HTML, then the column will not be displayed!
, :
NVL(wwv_flow.g_widget_action, 'EMPTY') != 'SEND_EMAIL'