I'm assuming that you are referring to these automatic reports
that are detailed in our documentation.
If this is correct, I'm afraid that it is not possible to exclude Group section or any other section from the report. All of them are always included.
What you can do is use the options to filter the alerts that you want to include in the report, as detailed here
If you think that this feature (exclude sections from reports) should be included in Wazuh, I invite you to open an issue
in our repository requesting it. We will later analyze and prioritize it.
I hope this information helps.