Set Nudge Value to 1/2 Note

Sets the nudge value to 1/2 note. Useful in editing and arranging MIDI. Pretty large value for nudging audio around.

Move regions in the Logic Pro Tracks area — Apple Support

You can nudge regions (move them in small increments) left or right using key commands. To nudge regions, you first set the nudge value, then move selected regions by this value. Alternatively, you can nudge regions by a set value.