Does your feature request involve difficulty completing a task? Please describe.
Are there more options to sort the books in the file browser ?? Like by the file type or books metadata as some time the file names of the books downloaded from the internet are varied .

Describe the solution you'd like
More sort options in file browser like metadata or file type , or combined with these two or more.

Sorry , I find the "type" sort options in the config menu. So there could be options with books name of metadata ??