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I use Librera Pro, but there is also a free version called (not surprisingly) Librera. In it's library view I have the option to list by Author / Series / Genre / ...
It then displays a screen with one button per Author / Series etc.
I transfer my data to the device using Calibre Sync connecting to a locally run calibre-web server. I know you don't want a server, I expect that Librera would also work with your existing folder.
Sent from my Pixel 4a using Tapatalk
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