Rightclick the game in Origin and select Move. It will take some time.
It is true that you can not just cut the Electronic Arts folder and move it to another drive If it was another internal drive it would be straight forward to move the entire Documents folder. For an external drive you will need to use a symbolic link which is not as easy and if you ever start the game without having the external drive connected you may face problems recreating the setup. If you would like to explore this route anyway check this out. https://crinrict.com/blog/2020/02/moving-windows-documents-folder-to-external-drive-via-symbolic-link.html
Notice that the game running from an external drive may be very slow. A better option is to upgrade the internal drive or if possible add a second internal drive.
