Menu: View→Interface Properties→Accessibility
Changes the level of magnification when you use 
.
See Inspect the path diagram under magnification
Programming
In Amos Graphics programs, you can select the first item in this ComboBox as follows (Visual Basic):
Dim aComboBox As Windows.Forms.ComboBox = Pd.GetComboBox("InterfacePropertiesForm", "LoupeCombo")
aComboBox.SelectedIndex = 0