If you still can’t find a setting, you can download latest KOReader source zip, download Total Commander for PC and use it to search text within files. Input text to search exactly as you see it in the UI, most probably you will find references somewhere in translations, for example.
Beware that variables are replaced by % or something, so start with one-word then extend if you have too many results. (E. g. “Increase frontlight by #”)
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