Crop a clip
Crop mode allows you to select a portion of the full screen recording or video clip to show in the final video. Use crop mode to hide unwanted portions of the video and only display the region of focus such as an application or website.
Crop a video clip:
Select a clip on the timeline and click the Crop Mode button.
The clip's border on the canvas changes to blue. Drag a handle to crop the clip.
Drag the clip on the canvas to position the clip within the video.