Adjust the Canvas Dimensions
The canvas displays a preview of the video at the location of the playhead on the timeline. For best results, adjust the canvas size to the dimensions you plan to export your final video to before editing.Set the canvas zoom scale to 100% for a preview for
how the final video will appear produced at the current canvas
dimensions.

- Select Edit > Adjust Canvas.
- The Canvas controls appear under the canvas. Camtasia dims the
entire applicaiton except for the canvas area. Enter the dimensions you
plan to export your video (in pixels) into the Width and Height fields
or select a common export dimensions from the Preset menu.

- Click Apply.
