How to shut off question feedback for all questions

HI there, I just want to know if there is a quick and easy way to turn off question feedback for all the questions in a quiz (i.e. without having to go into each individual question and select 'None' in the question feedback dropdown).

In quiz properties there is an option to 'Provide feedback by default' but unchecking this does not change questions that already have feedback selected.

Any help?

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