Win7 desktop background is not centered or other effects what to do

  
Win7 desktop background is not centered or other effects
Why do I win7 upgrade the flagship version of the desktop background to personalize what is not possible, I have a portrait of the picture I want to set to the desktop but can not see how to stretch Things
Yes, open the desktop after personalization, there is a desktop background option at the bottom of the window, after opening, there is a background display under the new window, there are stretch, tile, medium


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