If your PC has two or more operating systems installed in your computer, then one of the operating systems is chosen as default. This means one of the operating systems will start booting automatically after the time of wait elapses, even if you have not chosen any operating system. So choosing the default operating system is very important. If you use a single operating system more often, then set that OS as your default OS. The following tutorial will help you choose default OS to run at Startup in Windows 10.
Steps to Choose a Default Operating System to Run at Startup in Windows 10
1. First of all right click on Start Menu and go to Control Panel.
2. Go to System and Security. Click on System. Now click on Advanced System Settings.
3. Go to Advanced tab. Tap on Settings under Startup and Recovery.
4. Under Default Operating System, you will find the dropdown box for choosing the default operating system. Choose the desired option and save the changes.