Menu: View→Interface Properties→Misc
Checking this box displays variable labels on the path diagram when variable labels are available. Variable labels can be obtained from SPSS Statistics data files. You can also enter variable labels manually. (See To label a variable with a string other than its name.)
Programming
In Amos Graphics programs, you can put a check mark in this check box by using the following statement (Visual Basic):
pd.GetCheckBox("InterfacePropertiesForm", "chkDisplayVariableLabels").Checked = True