I just discovered that I've lost many sub-items that I thought were assigned to multiple parents.

1) Start with an item and sub-item in one grid, and a 2nd item in another grid =

2) Assign Sub-item to grid-2.  This grid now has two top-line items =

This has happened a few dozen times:  I hit ctrl-right arrow to move one item under another.  Instead of moving the item, it expands all the items in the grid to the 15th level.  I haven't been able to reproduce it.

How do I restore the grid so all items and sub-items are collapsed?  

Item>Sub-Items>Show Levels>1 = 
this collapses outline to 1 level, but leaves all the sub-levels expanded.

Item>Sub-Items>Show main sub-items = 
this helps but still leaves many sub-levels expanded.