DrawFBP uses two fonts: general and fixed size: the general is used for all text, while the fixed size is used for names of files.
Fonts can be changed by selecting File/Change Fonts - this will result in a display comprising two columns of fonts: fixed-width fonts, and all available fonts on your machine. The former is used for code, file names, etc., while the latter is used for general text. Each font will be displayed, showing its name, together with sample text in English and Chinese, allowing one to be selected. A font can be selected from either or both columns - the currently active one will be highlighted in pale blue.