If you have access rights to view, run, and schedule all reports, you can create private reports. If you do not have permissions to edit a public report that you want to modify but you do have permissions to create private reports, then you can save the public report as a private one and edit the private report.
To set the default report access scope as Public or Private:
ReportClient.properties file.DEFAULT_REPORT_SAVE_SCOPE property as public or private . If no scope has been specified, the previous scope will be the default.For more about publishing a report as public or private, see Publish Report Options. For more about access rights for reports, see Assigning Access Rights.