Hi @NatashaM46,
Dragging and dropping The Sims 4 folder into the new drive will not work. The Sims 4 is designed to have it's folder located on the Documents folder. If you want to move The Sims 4 folder, you'll have to move the whole User folder to the new drive.
Thanks for your reply @fons_garmo
Do you have any idea how to move my entire User folder into the external hard drive? I've tried my go-to method of dragging and dropping, but it just removed the documents folder from my finder sidebar. (No worries though, I've recovered it)
Here you have instructions about this: https://www.lifewire.com/move-macs-home-folder-new-location-2260157
Keep in mind that this is an advanced method and you should be careful. Don't do it if you don't feel sure about what you're doing and do not apply any changes if you're not sure.
