In the controller manager You need to use Deck Common> Move menu and use “Move”, “mode selector” and “size selector” all mapped to the same button on the controller. These will allow you to set the move mode as “loop” which allows the loop to be moved, the actual move to be backwards or forwards and the size can be set as “loop” which will allow the amount of movement to be the same number of beats as the current loop length.
If this doesn’t make much sense yet I would suggest you open up the move mode in the advanced deck panel & have a play with the various settings to see what happens; this will give a better idea of how these parameters work.