Permanently remove a canvas plane.
If you no longer need a canvas plane (for example, if you have finished sketching and exported the sketch image), you may want to delete it. (If you save a wire file that contains a canvas plane, the sketch image will be saved within the wire file, and the wire file may become significantly larger.)
You can also delete only the canvas information from the canvas plane (brush strokes, masks, and so on) but keep the plane.
To delete individual canvas planes
To select more than one canvas plane, hold down the key.
When a canvas is selected the pick icon turns red.
To delete the canvas information from a canvas plane
All the paint information (brush strokes, masks, background color, opacity, etc) is removed from the canvas plane, but the plane itself remains in the scene and can be used as a regular construction plane. (See Create or edit a reference plane and Work with the construction plane.)
To delete the canvas plane as well as the paint, pick it, then either press the key, or choose Delete > Delete Active.