We have seen what racking is and how to work in the Stitch view. This article will help you to rack the rear bed which you will need for specific stitches.
As an example, if you’d like to Knit Front & Knit Rear you would need to either rack to a half number to the right or left.
In this recording, you can see that Knit Front & Knit rear is not allowed unless you change the racking value in the most left option column to a half racked position. When knitting a regular double jersey, you would rack the bed 0.5. Racking with more distance is usually used for making cables, lace or other structured knits.