When you create a Scatter brush (go to Window>Brushes, and on the Brushes palette's flyout menu, choose New Brush, then Scatter Brush), you can set various options such as size, scatter amount, rotation, and more. If you apply a different Scatter brush to a stroke created with your new Scatter brush, you'll lose those brush options unless you hold down the Option key (PC: Alt key) when you click on the new brush that you want to assign a brush stroke to. |