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Start up your Mac in Windows or macOS using Boot Camp
After installing Windows, you can set the default operating system to either macOS or Windows. The default operating system is the one you want to use when you turn on or restart your Mac.
In macOS, choose Apple menu
> System Preferences, then click Startup Disk.Click the lock icon
, type an administrator name and password, then click Unlock.Select the startup disk that has the default operating system you want to use.
If you want to start up using the default operating system now, click Restart.
The next time you turn on or restart your Mac, it starts up using the default operating system.