How to disable the OCR engine?

When reading comics, if I move my finger on the screen, a prompt about installing an OCR engine pops up. I'm not interested in OCR, but the prompt won't disappear automatically. It keeps showing up every page I turn until I reopen the comic!

How can I disable this prompt? It seriously affects my experience of reading comics on KOreader. I hope someone can help me solve this problem.

Thanks!

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