Power BI Report Server "PUBLISH" Option - DISABLE / Remove

To disable the Power BI publish features, you can use the following code: 

select * from [reportserver].[dbo].[configurationinfo] where name like '%power%'
go
update [reportserver].[dbo].[configurationinfo] set value = 'False' where name = 'enablepowerbireportexportdata'
update [reportserver].[dbo].[configurationinfo] set value = 'False' where name = 'enablepowerbireportexportunderlyingdata'
update [reportserver].[dbo].[configurationinfo] set value = 'False' where name = 'enablepowerbireportmigrate'
go

To disable the Publish feature in SQL Server Reporting Services (SSRS) 2019,

1. Connect to the Reporting Services instance in SQL Server Management Studio (SSMS).
2. Right-click the instance name, select Properties.
3. In the "Select a page" pane, select Advanced.
4. Under User-Defined, set these items to False
   1. EnablePowerBIReportExportData
   2. EnablePowerBIReportMigrate

I did not have to restart Reporting Services for these changes to take effect.