The Graph Editor represents property values using a two-dimensional graph, with composition time represented horizontally (from left to right). In layer bar mode, on the other hand, the time graph represents only the horizontal time element, without showing a graphical, vertical representation of changing values.
To toggle between layer
bar mode and Graph Editor mode, click the Graph Editor button
in
the Timeline panel or press Shift+F3.
There are two types of graphs available in the Graph Editor: value graphs, which show property values; and speed graphs, which show rates of change of property values. For temporal properties, such as Opacity, the Graph Editor defaults to the value graph. For spatial properties, After Effects defaults to the speed graph.
In the Graph Editor, each property is represented by its own curve. You can view and work on one property at a time, or you can view multiple properties simultaneously. When more than one property is visible in the Graph Editor, each property’s curve has the same color as the property’s value in the layer outline.
When
you drag a keyframe in the Graph editor with the Snap button
selected, the
keyframe snaps to keyframe values, keyframe times, the current time,
In and Out points, markers, the beginning and end of the work area,
and the beginning and end of the composition. When the keyframe
snaps to one of these items, an orange line appears in the Graph
Editor to indicate the object you’re snapping to. Hold Ctrl (Windows)
or Command (Mac OS) after you’ve begun dragging to temporarily toggle
snapping behavior.
Keyframes in Graph Editor mode may have direction handles attached to one or both sides. Direction handles are used to control Bezier interpolation.

Select which properties are shown in the Graph Editor
Click the Show Properties button
at
the bottom of the Graph Editor, and select from the following options:
selected.
This switch is next to the stopwatch, to the left of the property name.
Graph Options in the Graph EditorClick the Graph Options button
at
the bottom of the Graph Editor to select from the following options:
Pan and zoom in the Graph Editor
Auto Zoom Height and Fit