How to return my stretched Windows Xp screen to normal?

How to return my stretched Windows Xp screen to normal? - 1

Added (1). I didn't even press anything to my knowledge; the screen is just suddenly stretched out of nowhere. In addition, sounds (Youtube videos, notification sounds) do not play normally anymore. I can't find any usable information on how to fix this problem. I use a Lenovo laptop that runs on Windows XP.

Make it non stretched.

Click on any empty area of desktop wallpaper with right mouse button, on menu is Display Properties, go to page and put in correct resolution for your monitor, whatever it is.
Search Google for sound device settings in your Lenovo model.