on the Watch Data view and select Collapse Trees from the drop-down menu to collapse a selected node. To collapse all expanded nodes, click the Collapse All Trees toolbar icon 
on the Watch Data view.After you have viewed the contents of a mapped item, you may want to collapse the tree of an expanded node in the Watch Data view.
To collapse the tree, right-click the node in the Name column of the expanded item in the Watch Data view and select Collapse Trees.
The Watch Data view collapses the node hiding the contents of the mapped item.
Note: Alternatively, you can click the View toolbar icon on the Watch Data view and select Collapse Trees from the drop-down menu to collapse a selected node. To collapse all expanded nodes, click the Collapse All Trees toolbar icon on the Watch Data view.