I went to Settings - Storage - Apps - Amazon Kindle and pressed the Clear Data button. Data went to 0 MB. Then launched the app, supplied my credentials, sync took only a few seconds. Then I went back to Settings — Data went to 212 MB with no books downloaded. Still ‘excessive’ but at least better than before.
After downloading the one book that was there before, storage went up to 213 MB. So the above procedure recovered about 174 MB of free space.
Perhaps things would be better on a more modern version of Android than 5.1.
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