You can use the model selector to switch between opened models.
The name of the current model (as defined by the model properties) appears
in the model selector. You can also use the Windows
menu on the Design Gateway
toolbar to switch between loaded models.
From the Design Gateway,
click the button next to the currently selected model’s
name.
A list of currently opened models appears. If you are viewing a model
that is not named yet, the text in the model selector is Untitled.