TV Repair Questions? Ask a TV Technician
When you press settings with your cable box remote, a QUICK SETTINGS will be displayed, at this time you scroll up until you see picture sizes then make your choice. Now as far as your tv remote goes, they are all different some will say picture sizes, also aspect ratio, and formats. These are all of the controls for picture's, you will have to toggle with both remote's to achieve your size that you want, and also to see how they change your picture, well friend i hope this was helpful and clear.
Well Good luck friend, and if unit works fine, feedback and a bonus will be appreciated