In no time, I was able to create a Windows 10 Bootable USB ... the second OS. It took around 20 minutes. Next, check the box which says, “Create a Windows 10 or later version of install disk.” ...

select "Mac OS Extended (Journaled)," and then click "Erase" to start the process. Give it a label like "macos_installer" to make this next part easier. We'll be using Terminal to create the USB ...