OS X El Capitan (10.11): Change the BIOS Boot Order
Change the BIOS Boot Order on OS X El Capitan:
1. Open System Preferences.
![System Preferences app](image/39280.png)
2. Select Startup Disk.
![Startup Disk application](image/39297.png)
3. Available systems will display: Select the system in the middle of the screen to use to start up the computer.
![Startup Disk window](image/39298.png)
4. Select Restart in the middle right of the Startup Disk window.
![Restart button](image/39299.png)
5. After the computer restarts, the changes will take place and the selected system will start to load.
Referenced from: Apple.com
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12/6/2023 3:24:50 PM