Click the Control Center icon in the menu bar
Click Screen Mirroring
Select the device you want to mirror to
Enter the AirPlay code if prompted
To stop mirroring, click Screen Mirroring again and select Turn Off AirPlay
If Screen Mirroring is not available, make sure Wi-Fi and Bluetooth are turned on
Make sure your MacBook and the receiving device are on the same Wi-Fi network
Open System Settings
Go to Displays
Choose the mirroring or AirPlay display option if available