In the Preferences window, the Undo preference settings let you specify the number of “undos” used by MotionBuilder.

To access the Undo preferences:

1. From the MotionBuilder menu bar, select Settings > Preferences.
2. In the Preferences window, click the Undo preference option.

   The Undo preference settings display.

   

   Undo preferences

The Undo Level value lets you set the maximum number of “undos”. You may want to reduce the number of undo levels to save memory and speed up MotionBuilder. The default Undo value is 10.

When activated, the Undo Control Rig in Auto Key Mode option lets you undo (Ctrl + Z) Character keys set with the Auto Key option in the Key Controls window. This setting is disabled by default as it can affect system performance.