have you checked that the "Rows Per Page" checkbox is checked in the "Search Bar" section of the "Report Attributes"?
As a developer, run the page, change the number of displayed rows and save the report as primary report so that it affects all users.
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I had the same problem, your solution work only for the report that have less row data in the table to run the report first, then to customize the report and save that report. For us that process doesn't work because we have so much information and the apex will try to run and process the data and this is taking forever and there is no way to wait and looking at the screen, this is so painful to watch.
Any other solutions?