Theme
You can change the theme of the admin console UI.
You can change the theme in Preferences > General > Console > Advanced Settings.
NAC 6.0: The background of the top main menu area is light-colored, which is the default theme for NAC 6.0.
NAC5: The background of the top main menu area is dark-colored, which is the theme applied to NAC5.
Re-authentication is required to apply the changed theme.