[raygj]

a possible work-a-round if you have a large number of books could be to set KOReader home directory to an empty directory(containing no ebooks).
But instead this directory contains a number of sub-directories (of which each sub-directory do contain a number of your ebooks).
FOReader should then start up quickly.and display all your book sub-directories.
what do you think?

I went back to <http://koreader.rocks/> and downloaded and installed the latest KOReader for android(KOReader 2021.01 "Magnetic Flux")(koreader-android-arm-v2021.01.apk)

I had trouble getting KOReader to start/function after I changed it to "/storage/384961C43F99D91E/books"(because i had way too many ebooks in this directory)

in the end I was forced to eject external SD card and then start KOReader and reset home directory to internal (/Books).
Inserting SD card into my computer
I created a new directory in the root directory of external SD card named "/Books1".
inside this directory (/Books1) I created 62 new directories named from "converted1" to "converted62".
I copied all my books from external SD card "/books" and divided them equally between the 62 directories.
I re-inserted the external SD card into Likebook.
I started KOReader and ( as in previous post)
I changed its home directory to "/storage/384961C43F99D91E/Books1"(my specific SD cards ID number(ebooks)directory)

Now KOReader fully functional again.
I just have to keep 2 copies(each with a different book storage layout/organization) of my library of books("/books" and "/Books1")
"/books" for use with "ALReader" and the "likebook" default ebook reader.
"/Books1" for use with "KOReader" ..
I also downloaded and installed "Bookerly" font.
I set font to "Bookerly"
It's a lot easier on my old eyes.