To Turn On/Off the Display of Levels
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In the Model tab of the Project Explorer dialog, select the desired model from the drop-down.
A list of levels and references is displayed in the dialog.
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Select the level, right-click, and from the pop-up menu, select Turn On or Turn Off.
If the level name is shown in black, the level is on in all enabled views. If the level name is shown in light grey, the level is off in all enabled views.