If you are unable to generate reports in the BookKeeper application, or you are getting blank page after opening a report, then please do the following step:
On Dashboard, go to Settings > Window Specific Settings > tick on Use Internet Explorer Based Browser.
If the above steps do not resolve the issue, please check these articles
Link 1: https://beebom.com/how-enable-and-use-internet-explorer-windows-11/
Link 3: https://www.pcmag.com/how-to/enable-internet-explorer-mode-windows-11
If these links doesn't solve your issue, reinstall .NET Framework
and update Adobe Reader to latest version.