KAMVAS 13 screen doesn't fit the full area of the tablet screen?

When the tablet is on duplicate display in the display settings the screen is smaller than the actual tablet screen, I've tried using extend display but the buttons stop responding when I do that. If you could help me either fix the screen in duplicate display or get the buttons to respond in extend display that would great. And the green button has been blinking since I've turned it on a second time. Please, I've been messing with the settings on the tablet and computer for three days now and I don't know what to do anymore.

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