Graph Editor graph view

The graph view of the Graph Editor displays animation curve segments, keys, and key tangents.

Right-click anywhere in the Graph Editor to open the pop-up menu containing the Graph Editor menu bar items.

In addition to the Graph Editor tools in the toolbar, you can use the Select Tool, Move Tool, and Scale Tool to manipulate keys in the graph view of the Graph Editor.

Graph Editor Time ruler

The Time ruler is the ruler that runs along the Graph Editor. It is where you can drag the Time Marker to set a key at a specific location.

You can change the color of the Time ruler background, Time Label (the numbers), as well as Time Ruler ticks in the Color settings.

Graph Editor Play Range Shade

The Graph Editor Play Range Shade is linked with Maya's Range Slider, except that it controls the playback range in the Graph Editor graph view. If you drag the Play Range Shade in the Graph Editor to resize the play range, the Range Slider at the bottom of the Viewport resizes simultaneously.
To resize the Play Range, drag the Play Range Shade (the darkened areas) along the Time Ruler.
Tip: You can change the color and opacity of the Graph Editor Play Range Shade in the Color Settings . See also Graph Editor Colors.

There are settings to hide and lock the Graph Editor Play Range Shade in the Graph Editor View menu.

Select Tool

Use the Select Tool to select curves, segments, tangents, and keys in the graph view.

Sweep with the mouse button down to select the contents of an area. You can click an animation curve, tangent handle, or key point to select the individual item.

Move Keys Tool

Use the Move Keys Tool to select and manipulate components of the graph view.

The Move Tool’s Move Key Settings are only available when the Graph Editor is active.

See Move Keys Tool (in the Graph Editor Edit menu).

Scale Keys Tool

Use the Scale Tool to scale a region of animation curve segments and the positions of keys in the graph view. See Scale Keys Tool.
Note: You can change the size of keys appearing in the Graph Editor Graph view with the Key Size option in the Graph Editor section of the Animation (Settings) Preferences.