Browser Overlays
Display the Status of Ratings, Keywords, and Used Media
Software: Apple FCP X

Browser Overlays are a great option in FCP X to learn more about your clips. To show these overlays, go to View > Show/Hide Marked Ranges.
Different color bars may appear on the top or bottom of your clips, where each color stands for something different.
* Green. That portion of the clip marked as a Favorite.
* Red. That portion of the clip marked as Rejected.
* Blue. That portion of the clip with one or more keywords applied to it.
In addition, if you choose View > Show/Hide Used Media Ranges, you may notice an orange bar. This indicates which portions of which clips are used in the Timeline.