Slip Left by Nudge Value    ⌃⌥←

Interesting ways to move things in the regions. I would compare it to a slide rule movement. Slipping shouldn’t be confused with rotating, which is also possible.

Move regions in the Logic Pro Tracks area — Apple Support

You can slip regions, which moves the content of the region left or right by the nudge value without moving the boundaries of the region. The content effectively moves inside the region, which remains stationary. Slipping a region is possible only when the source content exceeds the length of the region by the amount you slip (or greater).