Hi,
I would like to share a way out to resolve this issue:
1. Create a copy of the Dynamic Javascript page "xtk:adHocReport.jssp"
2. Hide the division that displays the navigation bar
3. Use the modified .jssp in your report url
for eg: https://<server_url>/<modified_namespace>/<modified_adHocReport.jssp>?reportId=<report_id>
Regards,
Anushka