Menu: View→Object Properties→Visibility→Use visibility settings
Uncheck this box to display all parts of the path diagram. When the Use visibility settings box is unchecked, the states of the Show picture, Show parameters and Show name boxes are ignored -- no parts of the path diagram are hidden.
See also:
Hiding objects, names and parameters
Programming
In Amos Graphics programs, you can put a check mark in this check box by using the following statement (Visual Basic):
pd.GetCheckBox("ObjectPropertiesForm", "checkUseVisibility").Checked = True