You can set the exact order of products you'd like to appear of the top of this campaign by Promoting individual items.
The simplest way to promote a product from anywhere on the grid to the top is to double-click on it.
You can also click and drag products around the grid to a desired position. If you drag a product to a spot that is after other un-promoted products, it will automatically promote all products in-between to achieve that desired position.
Products can also be promoted to the top using the Products toolbox.
Promoted products will be highlighted with an orange box. They can be un-promoted back to their original position by hovering over a product and clicking the "Stop Promoting" button at the bottom of the product.