You can change the following canvas settings:
You should set the canvas size before you begin painting. The canvas size is defined by the number of pixels along the height and width of the canvas. If you attempt to change the canvas size of an existing image, Paint Effects does not resample the image—instead, Paint Effects prompts you to save the image, then creates a new canvas of the specified size.
You can set canvas lighting, canvas scale, and canvas wrapping options from the Paint Effects Globals window.