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Hi, Syndicate_Admin 

According to your description, what you want is to implement cross-report replication visual. I tested it locally and the new Power BI Service interface doesn't seem to support cross-report replication is absolutely desirable, only visuals can be duplicated in the same report.

For the update to the navigation bar, I'm sorry, this can't be changed, this is a release update for the frontend, we can't go back to the historical version.

For your needs, you can try to download the .pbix file corresponding to the latest updated report to the local computer, then delete the connection to the data source in Power BI Desktop, keep the visuals in the report, and then update the data source to the dataset that needs to be changed (with a Live Connection connection), and then republish to create the latest report you need.

For more information, you can refer to :
Connect to datasets in the Power BI service from Power BI Desktop - Power BI | Microsoft Learn

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

Best Regards,

Aniya Zhang

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