How to Change your Default Startup Disk in Startup Manager

It can be an annoyance when you have multiple operating systems installed on your Mac, as remembering to change the default one it will boot to when you turn on the computer can commonly be overlooked.
Luckily, you can quickly and easily change the default disk in Startup Manager.
Simply hold down the option key to boot into startup manager then hold down the control key prior to clicking on a drive to boot from. This will not only boot to the drive you have selected, but also make it now your default drive for subsequent reboots!