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In Windows 8 there is no obvious way of checking how much space each Metro app is taking up--the option is actually hidden away in PC settings, read on to find out how to access it.
Viewing the Size of Metro Apps
Press the Windows + I keyboard combination and choose Change PC settings.
When the new Control Panel opens, head into the General section.
Scroll down on the right-hand side until you see the View app sizes button, then click on it.
This will bring up a dialog that will show you the size of each Metro app you have installed.
That’s all there is to it.