Attempting to delete a group section from the Explorer tab in the Web Report Designer leads to the following error being thrown in the browser console:
Uncaught (in promise) Error: Rollback inner transaction
RollbackTransaction http://localhost:51863/api/reportdesigner/designerresources/js/webReportDesigner-16.2.22.1109.min.js/:9
Rollback http://localhost:51863/api/reportdesigner/designerresources/js/webReportDesigner-16.2.22.1109.min.js/:9
execute http://localhost:51863/api/reportdesigner/designerresources/js/webReportDesigner-16.2.22.1109.min.js/:9
As a result, the section is not deleted. However, the section can be deleted by deleting the corresponding report group from the Properties area(Data section) in the Web Report Designer.