Touch the desktop screen. Keep your finger on the screen for 2-3 seconds, then lift your finger off. There's your right click menu. There's "Personalize".
To right click a Start Screen tile, keep your finger on the screen for 2-3 seconds until the tile moves slightly, then drag the tile down a tiny bit and let go. There are the Unpin from Start, Uninstall, All apps & tile size right click options.
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