In order to gain control over how the photos in your video are arranged, you need to move a few steps further with your project. First, you select the images that you want to add, you choose the template, then you pick a tune and generate the movie. Once that's done, the preview section will open and in the bottom-left corner, you will see the Edit button. Click it, then go to the Change Content tab and from there you should be able to rearrange your images.