Fundamentals > Working with the Model > Model Tree > Basic Model Tree > Model Tree Display > To Display or Hide Items On the Model Tree
  
To Display or Hide Items On the Model Tree
To hide items, select the item or items on the Model Tree, and on the mini toolbar, click Hide. The selected item or items are temporarily hidden in the graphics window and added to the Hidden Items layer.
To unhide, click the hidden item, and on the mini toolbar, click Show.
To display the hidden items, select the item that you want to display, and use one of the following methods:
On the Layer Tree, under Hidden Items, right-click and select Show.
On the Model Tree, select the item, and click Show, or click View > Visibility. Click the Show list and click Show.
 
* If you hide multiple items, click View > Visibility > Unhide All to unhide all the multiple items.
You can also display or hide the Model Tree by using one of the following methods:
On the Model Tree, double-click the top level to expand or collapse the Model Tree, respectively.
On the Layer Tree, click and then click Model Tree.