I am not familiar with your particular TV but I have sets from 3 different makers that all handle the problem you describe a little differently via the remote provided with the TV. One uses a Format button that allows you to go through each picture type as you press the button until you find the one you like best. Another has a Pic Size button that uses a pop-up menu that allows you to use the arrow keys to scroll through each type. The last one and most limited in choices requires you to go into the Menu from the remote and make changes through Settings or Setup to change the picture. Hopefully this may help.
Answers & Comments
I am not familiar with your particular TV but I have sets from 3 different makers that all handle the problem you describe a little differently via the remote provided with the TV. One uses a Format button that allows you to go through each picture type as you press the button until you find the one you like best. Another has a Pic Size button that uses a pop-up menu that allows you to use the arrow keys to scroll through each type. The last one and most limited in choices requires you to go into the Menu from the remote and make changes through Settings or Setup to change the picture. Hopefully this may help.
Is there a "format" or "wide" button on your remote?