Scanning 1/2 pages

I am scanning 3/4 page checks and it used to just scan and create the page without scaling...and would make it an 8 1/2 x 11 page as portrait and the bottom of the page would be blank.  Now when I scan it wants to make my 3/4 page fit the entire page and automatically turns it landscape instead of portrait.

I do I fix this?

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