"Mac dual system Setup system default Boot system" solution

Solution 1:

Press and hold the option key to enter the system Selection screen:

Use the left and RIGHT arrow keys to select the disk you want to set as the default startup,

Then press the Ctrl+enter key at the same time to set it as the default boot system.

Solution 2:

After selecting the Mac system to enter,

Click System Preferences-----> Boot Disk-----> enter as interface:

First click on the bottom of the lock image, and then make changes,

After selecting the system you want to set as the default boot, click the Restart button to take effect.

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"Mac dual system Setup system default Boot system" solution