You can set the following preferences in the Animation sub-category of the Display preferences in the Preferences window. (There are also Animation preferences in the Settings category. See Animation (Settings) preferences.)
To return to the default factory settings, choose in this window. Note that this resets the preferences in every category in the Preferences window.
Specifies how many ghosted images are drawn at frames before the current frame. The default is 3.
Specifies how many ghosted images are drawn at frames after the current frame. The default is 3.
Specifies the number of frames between drawing the ghosts. The default is 1.