In Telerik Reporting versions before 18.1.24.514, I could change the order of items in a section by dragging an item up or down in the Report Explorer list.

If I try that now, nothing seems to happen on the screen. Dragging does not appear to change the position of an item in Report Explorer; the item appears to be fixed in place.  However, if I close the report and reopen it, the position of the item may have changed.

The same happens if I use Send To Back/Brink to Front on an item.  The new item position is not updated in the Report Explorer.