Easing specifies the speed at which an animation progresses from start to end within the animation.
EASING FOR MOTION PRESETS
Click the preset name on the timeline> go to Easing.
EASING FOR CUSTOM ANIMATION
For custom animations, hover your cursor over the track and click the line between keyframes.
Click the Easing tab and select an easing
EASING PREVIEW
Linear
Smooth
Slow Fast
Back
Elastic