How to make page size

I make page size as Format - Page style and then page tab, which is ok. But then A4 or letter or what? I want a 8x10 page size in reality

I want a 8x10 page size in reality

Simply enter this in the appropriate fields.

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… though it might be better to create a new page style (e.g My8x10) instead of changing the size of Default Page Style.