Using Manjaro to create a bootable Windows 10 for dual boot?

I am using Manjaro to create a bootable Windows 10 USB. I watched an how to video. I have the Windows 10 download, and formatted the USB, but on start up to upload, it was not bootable. The option to make a bootable USB in Disk from Utilities, was I think light gray and not bold. I don't know how to make the USB bootable and in operation.

Disk allows formatting... But when I opted for FAT 32 the 16 gb sandisk 3.0 would not take the files from Windows 10 the loader said it only had 4 g space so I used NFTS. Then It took them via Disk Image Mounter and a copy and paste into the USB.

I then want to run Windows 10 and dual boot with Mint 20.2. On an old legacy BIOS desktop, with an SSD.