Currently, there is no way to drag and drop the slides once they are created. However, what you can do is Edit the slideshow, then Edit the first slide, change it to use the picture from the last slide. Finally, Edit the last slide to change it to show the picture from the first slide.
Please follow the path in order to change the pictures based on your requirements:
Pressero > Sites > Site Name > Appearance > Widgets > Banner > Edit
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