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One thing to consider is whether your users are currently blind to that second column or not. Maybe it has been there for a long time and has become a learned behavior to check. Try to get some data on this first. It seems like the second column wouldn't necessarily violate the F pattern since it's well within the top of the page / top of the F. Furthermore, ...


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As you have a big space in the middle before read your post I considered the vertical reading. If you would like to reinforce for users that the form should be read in vertical, just use a middle light grey line. If you would like to read in horizontal you should reduce the white space in the middle. You also can use some light grey lines to split the form ...


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