By default, with the preprocessor option on or off, the elements inside the inactive preprocessor regions are visible in the Outline view. These elements appear in gray.
Note: You can use the Outline Filter Preferences to hide them from the Outline view.
To view inactive preprocessor region elements:
1. Open Outline view by selecting Window from the main menu, and then Show View > Outline.
2. On the Outline view toolbar, select View MenuFilters. The Outline Filter Preferences window appears.
3. Click to clear the Inactive preprocessed regions check box.
Note: To hide the inactive preprocessor elements from the Outline view, select the Inactive preprocessed regions check box.
Filters 
. The Outline Filter Preferences window appears.