All content (including animations) scale proportionally up to 100% of the page width; the title page is excluded.
If the mobile device is turned to portrait format, the view adapts and shows one page only (proportional to 100% page width), and the left page appears first. In landscape format, both sides show a double page.
This content fit strategy is best suited for print layouts (DIN A4 or letter format, 2: 3 aspect ratio) with double pages that are as PDF. The content in both pages is displayed in a reader-friendly manner on tablets. To do so, page rotation must be enabled in the app. Zooming (up to 400%) should be enabled on mobile phones; Otherwise, text in particular will not be displayed in a reader-friendly manner.
During a PDF import into Purple DS Composer, this content fit strategy is applied automatically.