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#41
The Media creation tool has two options for saving the install media. One is to create it on a USB (which is what you have done successfully, from your screenshot). The other is to save as an ISO file (with a *.iso extension) which could be burned to a DVD later. It is also possible to create a usb like yours from a .iso.
You made a USB directly using the MCT so any references above to the ISO file don't apply to you. You already have the install media on a USB that is capable of booting in bot UEFI or Legacy mode.