Safari window is stretched, getting it back?

[mbell75]

Well I am viewing at the highest resolution and I clicked the green button and my Safari window expanded on my 20 inch but wont go back to the more narrow view now. Any ideas how to get it back? Thnaks

 

[Cromulent]

Click and drag on the bottom right hand corner.

 

[mbell75]

Click and drag on the bottom right hand corner.

Thanks alot!