You can access the Animation Layer Editor as part of the Channel Box, or you can open it as a separate window.

To access the Animation Layer Editor in the Channel Box

1. At the bottom of the Channel Box, switch to the Anim tab.

To open the Animation Layer Editor as a separate window

1. At the bottom of the Channel Box, switch to the Anim tab, then select Show > Floating Window from the Animation Layer Editor menu bar.