Change a Keynote theme on iPad
You can change the theme of a presentation at any time. Your existing slides inherit the attributes of the new theme, including object styles, title styles, and more. If you customized anything on your slides—for example, if you changed slide backgrounds or the color of text—you retain those changes.
Note: You can’t change the theme of a presentation you’re sharing with others.
Change the presentation theme
Tap in the toolbar, then tap Document Setup.
Tap a theme or swipe left on the thumbnails to see more themes.
Tap or to preview slides in the new size.
Some themes aren’t downloaded to your device until you choose them or open a presentation that uses one. If your connection is slow or you’re offline when this happens, placeholder images and slide backgrounds in the presentation may appear at a lower resolution until you’re online again or the theme finishes downloading.