Screen projection shortcut key: win+p (win10 can click the notification in the lower right corner, and then click projection)
The difference between several projection options:
1. Only the computer screen: only the computer display, the second screen does not display.
2. Copy: The second screen displays the same content as the computer. Commonly used in projectors.
3. Extended: The second screen becomes an extended area of the computer. Often used for multi-display linkage.
4. Only the second screen: the computer does not display content, and only the second screen displays the content of the computer.