When you display the Paint Effects canvas, the Paint Effects Tool is selected automatically. The cursor shows the width of the stroke path. For simple strokes, the brush width defines the paint stamp. For strokes with tubes, the brush width defines the stroke path boundary—tubes can start growing only within the path defined by the brush width.
To paint brush strokes on the canvas
If you do not select a preset brush, the next stroke you paint uses the current settings for the template brush.
There is only one level of undo—you can only undo the last stroke.