The emulator does not currently support this (this is a limit on the size of some memory areas it uses). However, you do not need to work with this resolution, because there are no devices sending with this size.
For sizes such as 1024x480, what do you say that the parts are not visible, I assume that this is because the resolution window does not fit on your computer screen? If so, you can specify an argument to the emulator (I forgot what it is) to scale the screen to fit. Although, of course, you will not see all the pixels that your application draws.
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