If you are using sales catalogs as your display mode, you may now rearrange your looks with a simple drag & drop.
As a brand manager, head to the top navigation and click on "Collections / Sales catalogs", then choose the sales catalog to manage, then open the "Looks" tab.
Sorting looks with drag & drop
As a reminder, look items may also be sorted using drag & drop. As a brand manager, go to "Collections / Looks", then choose the look to manage and scroll down to "Look products".