A bit like adjusting the flow on an airbrush.
With a coat, style or effects tool selected, press and hold .the secondary square button
Twist the secondary controller to turn the rate up and down.
You can then instantly apply it at that level to lots of objects. Use the primary T button to apply as usual.
The higher the rate, the more the tool is applied (or removed), and vice versa.
The Dreams User Guide is a work-in-progress. Keep an eye out for updates as we add more learning resources and articles over time.