My macbook 13 inch says it is a 15 inch, how to change properly?

my macbook 13 inch says it is a 15 inch, how to change properly?
since i got osx istalled via an usb my macbook thinks that it is an 15 inch. while it is a 13 inch.
i tried to reboot by shuting of my macbook. restarting it again while holding alt. and reinstalling osx via internet download.
but nothing really changed. what to do now?
sincerely,
Felipe

You didn't post a pic confirming that you screen is actully 13."  Do you have a measuring tape and or a ruler?  Place the tape or ruler diagonally across the screen.

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