I need to sign out and unlink my iCloud account from my work computer but it will not let me while iCloud drive is updating. I try unchecking the box under System Preferences > iCloud and go through the prompts; Remove from Mac (or Keep a Copy) > Stop Updating and Turn Off > Turn Off iCloud Drive, then it says turning off momentarily but remains checked and I still cannot sign out. I've deselected all the options hoping that's speed up the sync process, but still no luck. I also can't remove internet accounts because of this. Is there any other way to interrupt this process?