Hi,
Thank you for sharing the detailed information about the problem. If the Reporting pane does not exist, it indicates the reporting server is not installed properly. For this issue, we may try reinstalling the reporting server in the database server, connect to the management server during the installation and check if exists when finished.
How to install the Operations Manager Reporting server
https://learn.microsoft.com/en-us/system-center/scom/deploy-install-reporting-server?view=sc-om-2019
Alex
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