Plug your monitor, go to System Preferences -> Display -> Arrangement, uncheck the Mirror Displays box.
How do I stop dual screens from mirroring?
Plug your monitor, go to System Preferences -> Display -> Arrangement, uncheck the Mirror Displays box.
How do I stop Windows screen mirroring?
Step 1: Open the Control Center on your device. Step 2: Find and click on the Screen Mirroring option. Step 3: Then choose Stop Mirroring or Stop AirPlay.