Prevues can be re-ordered within a project by simply dragging and dropping their position. Select anywhere on the thumbnail image to drag, or just click the title to view.

Re-ordering your work will automatically update the pagination of your Prevues when viewed in fullscreen view. It will also update the order in which your client sees your project.

You can also change the order of your projects, as displayed in your portfolio from the Portfolio section. For more information, read this article.