Using the Animation palette
The Animation palette lets you create, view, and set options for the frames in an animation. You can change the thumbnail view of frames in the Animation palette--using smaller thumbnails reduces the space required by the palette and displays more frames in a given palette width.
Displaying the Animation palette
Choose Window > Animation. A check mark indicates that the palette is showing.
Using the Animation palette menu
Click the triangle 
in the upper right corner of the palette to access commands for working with animations.
Changing the size of animation thumbnails
Choose Palette Options from the Animation palette menu, select a thumbnail size, and click OK.