Printer Repair Questions? Ask IT Technicians for Answers ASAP
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I think you need to set the Paper Size setting in the driver Properties for the Canon MG7520 printer. Possibly to a Custom Size, or User-Defined values.
Be sure you don't confuse the horizontal and the vertical dimensions, of course.
The above assumes that you are using 8 by 10 paper stock. If the size you want the photos to print is the size of the printout of the photo upon the 8 by 11 standard paper, then the solution would be different.