How do I change the screen resolution on my Dell PC back to the original setting after itune change ?

How do I change my Dell PC screen resolution back to the original setting after itune resolution changes

Hi penguin05,
Welcome to Lenovo Community Forums!
   First without the projector connected
           Right click on your desktop screen and select "Screen Resolution"
             you will get this page
Spoiler (Highlight to read)
Now Connect your projector and make sure that the display is now on your projector.
   under Display: Set it to your projector
             -Change the Orientation: to Landscape View then hit Apply.
Let me know your findings
Regards
Solid Cruver,
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