Absolutely, yes you can use Dabble to write non-fiction. Though fiction is the current focus, non-fictions can 100% be done using Dabble software.
Narrative non-fictions such as biographies and autobiographies work very well in Dabble. Things like textbooks, business books, and self-help books are also very much doable within Dabble, but it may take a little extra fine tuning and formatting. Nonetheless, Dabble is still quite helpful!
Don’t worry, Dabble is always working on expanding features for all genres and writing styles!