To set curve behavior

1. In the Graph Editor, select the curve.
2. Select Curve > Pre Infinity or Curve > Post Infinity in the menu bar.

   The Pre Infinity or Post Infinity menu appears. Each menu contains a list of curve behaviors.

3. From the lists that appear, select a pre or post infinity behavior option. See Pre and Post Infinity animation curves options.

   For Pre Infinity, the option you select sets the behavior of the curve before its first key.

   For Post Infinity, the option you select sets the behavior of the curve after its last key.