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I don't know what a "map in the file manager" would be unless you mean a directory/folder. It may be that if you delete the SDR file or folder you would accomplish the same as the purge function in KOReader, not sure it would work that way. This could be quickly done while your device is connected to your PC. There is now an effort to move such things into an SQL database. (Something I am leery of.) If implemented, the SDR approach would no longer be available.
The books with SDR appear differently in the File Browser listings and change back to match the others when "purged".
Luck;
Ken
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