At 1280 x 1024 you should be able to see approximately two thirds of it minus whatever screen acreage you have allocated for Hornfans. Is that not the case for you? Hmmmm ...
At 1600 x 1200, which is what I normally view, I see about 95 percent of it when I open the file.
If I make it snapshot size, it is hard for people to use as a desktop background and I have had several people send me PM's telling me that they are using them for exactly that.