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As an administrator, go to Cog Icon > Manage apps.
Note icon false If you are using an earlier version of Reporting, you must use this configuration URL: <confluence-base-url>/admin/plugins/reporting/config/viewObjectLimit.action
In the left sidebar, scroll down to Reporting Configuration, and click on Configuration.
In the Reporting configuration screen, you can specify the size limit for Reporting results. In the example below, it is set to 200 results.
Click Save, and you're done.