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.
You can use hotkeys on the canvas to interactively change the Global Scale (ModifyUpperRadius under Brush Tools, default hotkey, b) and the Brush Width only (ModifyLowerRadius in the Hotkey editor under Brush Tools, default hotkey, B). You can find the Global Scale and Brush Width settings in the Paint Effects Brush Settings window (Paint Effects panel menu bar, Brush > Edit Template Brush). For information on other Paint Effects hotkeys, see Use default Paint Effects hotkeys.
There is only one level of undo—you can only undo the last stroke.
You can define a hotkey to undo the last stroke (under Paint Effects in the Hotkey editor, define UndoCanvas). For information on other Paint Effects hotkeys, see Use default Paint Effects hotkeys.