Nudge Region/Event Length Right by Nudge Value ⌥⇧→ – Logic Pro keyboard command of the day

  Nudge Region/Event Length Right by Nudge Value    ⌥⇧→

Lengthen the selected Region/Event on the right using the current nudge value.

Change note pitch, duration, and velocity in the Logic Pro Score Editor – Apple Support

Use one of the Nudge Region/Event Length key commands.