How do I gain my computer blind to return to the Widescreen display?

I hold a dell inspiron E1505. I was working on my computer when my blind went from the widescreen to the size of a common screen. I hold no idea what button I hit but I'd close to to change the blind back to regular. Any ideas?

Answer:
Right click your desktop situation and click Properties. Click the Settings tab and then adjust your resolution. You will probably want something resembling 1280x800 for your screen.

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