1. Preview the project.
2. As you move from slide to slide, notice that the quality of the slides is actually quite good (astonishing, considering that you rescaled the project to make it significantly larger).
Note: Although the quality of the rescale worked with this particular project, keep in mind that rescaling can lead to a loss of image quality.
3. Close the preview.
4. Close the project (there is no need to save it).