Auto Slur Above — Logic Pro keyboard command of the day (KCotD)

  Auto Slur Above

Attach an automatic slur above the selected notes. The slur will adjust when you move a note or change the pitch. Very handy.

Add dynamic marks, slurs, and crescendi to a score in Logic Pro — Apple Support

You can add and edit automatic slurs, which automatically adjust to cover a selected group of contiguous notes. Automatic slurs adjust when notes are copied, moved, or transposed. They do not overlap with notes, accidentals, or most score symbols.