On the View tab of the Narration Editor toolbar you can configure what elements of the interface to display.

Option | Description |
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Slide Thumbnails | Select this checkbox to display the side bar with slide thumbnails. |
Slide Notes | Select this checkbox to display the Notes pane with slide notes. |
Video Track | Select this checkbox to display the video track on the timeline. If you do not want to insert a video narration to your presentation, it makes sense to hide the video track to maximize the screen estate. |
Audio Track | Select this checkbox to display the audio track on the timeline. If you do not want to insert an audio narration to your presentation, it makes sense to hide the audio track to maximize the screen estate. |
Background Audio Track | Select this checkbox to display the background audio track on the timeline. If you do not want to insert background sound to your presentation, it makes sense to hide the background audio track to maximize the screen estate. |