@MadamWalsh Sims 4 will always create the user folder in Documents > Electronic Arts. This is separate from the program files, which you can install wherever you like, in your case on D. If you want to move the user folder, you'll need to create a symbolic link:
You can move the user folder to almost anywhere, but do NOT combine it with the game's program files. This will cause problems sooner or later and also makes troubleshooting standard issues a lot more complicated.
If you need further help with the process, please post a screenshot of the Command Prompt window showing the command you entered and the result.
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