Normally, when a file is opened in Navisworks running from the Factory Design Suite, the last file in the Selection Tree is automatically selected and the view is zoomed to the extents of that file. If the last file has both very large and small models in the layout, the view zooms out so much that the small models are often not visible.
To prevent this behavior, select Append File in the Navisworks Options Editor dialog and activate the Start Transform command after appending file check box shown below:
To open the Options Editor, right-click in the Navisworks graphics window and select Global Options from the pop-up context window.
There are several things to keep in mind regarding this setting: