The Show app allows you to create presentations using ready-made backgrounds and formatting presets. The app provides various themes with a prebuilt set of fonts, colors, and background options to help maintain consistency throughout your slides.

 To create a presentation on your iOS device using themes:

1. Tap the icon at the bottom of the listing page. By default, this will open the Themes  window, containing a list of pre-built designs.
   
   

   

2. Pick an appropriate design from the Themes tab, then tap the Create button at the top-right corner to open the presentation. 
   
   

   

3. Tap the icon at the bottom-right corner to add more slides with your preferred layouts. You can also preview your slides at the bottom as thumbnails.