The matrix questions will produce 5 columns of radio buttons by default; change the number used:
Time: less than 2 minutes.
Skill level: All
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Edit your survey with the page editor.
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Open the question wizard selector.
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Select either of the matrix questions.
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Click the “Show options” button.
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Change the number of columns used to 10.
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Click the “Update” button.
That’s it! The matrix question now has 10 columns instead of 5.