The Re-time settings move the keyframes of the selected object at the right of the current time without modifying the value. This is a purely temporal modification that slows or speeds up the animation.

Set n

-n

Sets the right keys to the left according to the number of frames defined by Set n.

-1

Sets the right keyframes one frame to the left.

+1

Sets the right keyframes one frame to the right.

+n

Sets the right keyframes to the right according to the number of frames defined by Set n.

▐ +n ⬅

Moves the first right keyframe far enough so that the distance between the previous and the next keyframe is equal to the time defined by Set n. Here, you can also apply the Shift key.