In the world of ebooks, a very important concept to understand is the difference between the two ebook layout modes: reflowable and fixed layouts. Each layout mode has its own uses and benefits, depending on the nature of the ebook and the target audience.

Reflowable layouts make a strong distinction between content and design. The layout of the content is rendered according to the screen dimensions. The content wraps itself and the text reflows matching the screen width. An advantage of reflowable layouts is the ability for users to adjust the font size to their preference, having the layout adapt to the new size. This gives a good reading experience especially with smaller screens. With reflowable layouts, you will never find horizontal scrolling.

Although the idea of reflowable layouts sounds perfect, it does not make peace with every ebook. Some ebook content is too intermingled with the layout, that they can not be separated. Popular examples are magazines, comic books, or children storybooks. Hence the other layout mode: fixed layout. In this layout mode, every element of the page has a fixed position that does not change no matter what. The content does not adapt to the screen dimensions. There is a specified width and height for the page. Font sizes cannot be changed, but the entire page can be zoomed in and out just like an image. If the page exceeds the viewport area, horizontal scrolling is used. A popular format that uses fixed layout is PDF.

When creating chapters in Kotobee Author, you are always asked what type of layout you want to apply:

To prevent being asked every time, simply check the Don't ask again box. In future, if you want to be given the choice of layout modes again, click on the button with three dots right next to the New chapter button.