User Guide

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However for some other phones like Huawei Mate 10, Huawei P20, you can use
mirror or extend function.
MacBook, iMac series, iPad Pro with Type-C port
For macOS laptop like 12-inch MacBook, MacBook Air with Thunderbolt 3 port,
MacBook Pro 13-inch & 15-inch & 16-inch, iMac, iMac Pro, Mac Mini
You can go to Apple icon

System Preferences

Displays—Arrangement

mirror
displays. This is the way how to mirror your Display. If you did not choose mirror
Displays, your HDMI monitor would just be as another monitor of your Mac.
The following screenshot was about Mirror Displays options.
For iPad 11-inch & 12.9-inch
You can hook this adapter and your HDMI monitor.