The Offset effect pans the image within a clip. Visual information pushed off one side of the image appears on the opposite side.

Shift Center To

The new position of the original image’s center point.

Blend With Original

The effect’s transparency. The result of the effect is blended with the original image, with the effect result composited on top. The higher you set this value, the less the effect affects the clip. For example, if you set this value to 100%, the effect has no visible result on the clip; if you set this value to 0%, the original image doesn’t show through.