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Understanding the time graph
The time graph portion of the Timeline window contains a time ruler, markers to indicate specific times and current work area, and duration bars for the layers in your composition. Use the time graph to adjust the range of time shown in the Timeline window, and to specify a range of time to render when creating or previewing a movie.
The time graph also contains controls for adjusting time for layers and controlling motion and changes over time. (See Positioning a layer in time.)
A. Time Navigator Start and End brackets
Drag to magnify or shrink a section of the time ruler. These markers are part of the navigator view, described below. Drag to view a specific area. (See Viewing and setting the current time.)
B.
Time ruler
Indicates the part of the composition duration currently displayed in the time graph.
C. Navigator view
Uses smaller versions of the work-area markers and current-time indicator to show their relationship to the entire composition. As you drag the viewing-area markers to change the view, the miniature markers in the navigator view show your view and the location of the current-time indicator in the context of the full duration of the composition.
D. Work area markers
Indicate an area of the composition for rendering or previewing. To render only part of the composition, drag the work area marker to specify the part of the composition to render. (See Setting up a work area.)
E. Timeline Window Options
Displays the Timeline Options Menu, which includes functions affecting layers and keyframes, as well as providing access to the Composition Settings dialog box.
F. Comp marker bin
Add markers to the time ruler. Drag the marker to a point on the time ruler. Drag it back to remove it.
G. Comp button
Click to bring forward the compostion related to the active Timeline.
H. Zoom slider
Drag to magnify a portion of the time graph or to see more of the time graph. You can also use the zoom-in button 
or the zoom-out button 
.