Overview - Mastering Unity 2D Game Development - page 18

You can also manually edit the Dope Sheet tab without the recording mode enabled by
adding the curves (the Animation properties) and selecting the property on the attached
object that you wish to animate.
For extra visibility, there is a Preview window next to the Animator controls. So, you can
see a close up of the effects of the changes you make to the animation.
In the 2D system, animations automatically generated from the spritesheets lean very
heavily on this feature, making it very powerful for 2D.
We will cover the animation Dope Sheet system in Chapter 3 , Getting Animated , so stay
tuned.