In Settings Go to roles and create a role, then inherit user or poweruser to it. There is a option called export_results_is_visible in Capabilities of that role just disable it. Hope it helps...
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This is also documented in the ITSI user manual: http://docs.splunk.com/Documentation/ITSI/3.1.0/User/Managenotableeventindexes#Clear_all_notable_events
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