Click the Windows logo in the bottom-left corner of the screen. The Start menu will open. Click the gear-shaped icon in the lower-left side of the menu. It's a computer-shaped icon in the Settings window. This option is on the left side of the Display window. It's near the bottom of the page. Doing so prompts a drop-down menu. It's an option in the drop-down box. This will ensure that your TV's screen acts as a continuation of your PC's screen (rather than just duplicating it). Moving your mouse all the way to the right edge of your computer will move the mouse onto your TV's screen, where you can proceed to use the computer like usual.  Any content on your computer's screen will remain as it was before extending the display. Think of the TV as a screen immediately to the right of your computer's screen.

How would you rephrase that briefly using Chinese?
打开“开始”。 打开“设置”。 点击系统。 点击显示 选项卡。 滚动至“多显示器”部分。 点击“多显示器”下拉框。 点击扩展这些显示。 使用已扩展的电视显示器。