Autodesk® Revit® automatically joins the elements with its default rule. If you want to switch the join order between elements you have to do it manually.
If you have a project with thousands of elements that need to be switch joined, this would be a huge task.
This tool will help you to quickly Join and Unjoin as many elements as you like with your defined order.
Note: This app uses a custom installer (and not the standard App Store installer).