Select this check box to track history of view display in
the current working session. Once they are displayed, views are
identified in the specification tree with a light purple background.
Note: Already-displayed views will remain highlighted with the light
purple background within the current working session, even if you
deactivate the setting later on.
Views that are not displayed yet are identified in the specification
tree using a transparent background.
Refer to 2D Layout for 3D Design User's Guide: View Management:
Displaying Views for more information.
By default, this check box is selected.