Apple Motion 4 - Manual (Page 1481)

Because the behavior creates an animation in which the text starts above its original
position and drops in, the behavior selection box moves up in the Canvas. Also, the
selection bar is located at the left edge of the box because the animation starts at the
leftmost text character. This appears and displays the projected motion of the text.
Behavior selection box
Once applied, the Drop In From Left behavior appears in the Layers tab and Timeline.
The HUD also appears. Remember that because the sequence behaviors are all preset
variations on the Sequence Text behavior, the Drop In From Left HUD parameters are
identical to the parameters in the Sequence Text behavior (in the Text Animation
subcategory).
1481 Appendix E Obsolete Text Behaviors