You can save time or start over by duplicating or deleting your slides.
Deleting a Slide:
If you would like to delete a slide, just click on the 'Delete' button on the slide's action panel.
Duplicating a Slide:
If you would like to duplicate a slide, click on 'Duplicate' on the slide's action panel.
NOTE: If you don't see these buttons, first click on the page itself from the left Pages Menu, or click on any gray space outside the canvas.