Boox Color Series User Manual page 65

Bottom Menu (other format)
TOC, Format, Progress and Split screen are included. It supports the
formats of EPUB\TXT\MOBI\AZW3,etc.
Format
The settings include Font Face, Display and Spacing.
Loading font face in the directory Storage\fronts is supported.
The settings for font size, font face, contrast, bold, spacing work on all
newly opened documents, but not work on the documents before settings.
First line
indent
Line break
hyphen switch