Nudge Region/Event Length Right by 1 ms

Lengthen (on the right edge) the selected region by 1 ms.

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.