About the canvas
The canvas displays a preview of the media within the video at the location of the playhead on the timeline. The canvas allows you to drag clips, shapes, and text directly on the canvas to set the position within the video and drag the corners to scale the clips. Any portion of the clips, shapes, or text located outside of the highlighted canvas area will not be included in the final video.

For best results, adjust the canvas size to the dimensions you plan to produce your final video to before editing. Set the zoom scale to 100% for a preview for how the final video will appear produced at the current canvas dimensions. To zoom in or zoom out on the canvas, use two-fingers to scroll up or down on the mousepad or click the dropdown.