Sheet Menu - Drag & Drop Elements within Elements to Rearrange Them

In the Sheet Menu object, there is the option to drag & drop elements to rearrange their order.  However, if we add elements within an element ( a sub-element so to speak), those cannot be dragged and dropped to rearrange.  It would be nice if this was possible.  We have a lot of sub-elements and they change from time to time.  The only way to re-arrange them is to delete and re-add them.  

See attached screenshot for list of sub-elements that can't be dragged and dropped to rearrange them.

We are on Sheet Menu version 3.4.1