> Canvas Cropping
> Canvas cropping is used to change the resolution or aspect ratio of the workspace you have to edit in. This can be useful if you want to constrain your screencast to only a portion of the total recording (i.e. a foreground window).
> Canvas cropping is accessible through the canvas cropping button located on the left side of the tool bar.
> This is set by numerically entering the width and height values or dragging the edge of the canvas with your mouse cursor.
> The canvas can be set to a size larger than the original recording by using the File>Document Settings . Remember, the canvas size represents your total usable display space, which converts to the frame size of your video when you export or publish it.
> Figure 4. Canvas Controls