It shifts all pixel rows, horizontally or vertically, in the current layer or selection, on a random distance and within determined limits.
The result of your settings will appear in the Preview without affecting the image until you click on
.This option sets the dimension where pixels are moved.
Pixels going out one side will come back on the other side.
With this option, you can set the maximum shift, between 1 and 200 pixels, or in another unit of measurement.