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For the application itself it shows correctly for me (Windows 10 Pro 64 bit) as being around 195MB in File Explorer>Program Files and in Settings>Apps & features.
As others have alluded to, if you are looking at your library instead of the application files then the size is entirely dependant on the number and sizes of the books you have in it. My library shows as the correct size in File Explorer.
Perhaps you need to explain exactly where you are looking when you come up with the more than 5GB?
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