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My laptop is also a touch screen. I had to go into Device Manager and disable the touch screen. When you hover the mouse over your name on the menu bar, the drop-down menu appears so you can change profile settings, etc. But that doesn't work if you have the touch screen enabled, because it's expecting you to touch-click for an action to happen. Same thing for the thread hover preview. With touch screen enabled, it thinks you're a tablet computer (because you are).
You can disable/enable the touch screen in Device Manager at will, and the change is immediate.