Answering to your question straight away, it is impossible for the moment. AppSheet scanner will scan all the different types of the codes as far as the appsheet scanner is readable. You are not able to able/disable a certain type of code arbitarily. That is the current limiation of capability of Appsheet scanner.
Additionally, on iOS, there is no focus on iOS scanner (with Android, this is not a case), so we are rolling a dice to see which code the scanner is actually reading if you have documents where the codes (bar and QR etc) are sitting in the vicinity. Actually it is difficult to know to see which Code the scanner actually read. Thats another limitation. (Less useful) Again this is a case for iOS.
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