Size of the shop on the screen

I am just beginning to build a shop. When I visualized it, the page size is smaller than other existing!
Could you please tell me how to make the page larger on the screen?

If anyone can help me it's to be great

I want to thank the kingeshop team to provides at us a great product for free.

Author : Cathy
Readings : 391
Creation : 2011-11-15
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