Sims 4 repeatedly installs to both drives
When installing Sims 4, I choose my D drive but have found that Origin is installing the game to both my C and D drive, defeating the entire purpose of choosing a directory for installation. The Sims...
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Have a peek under the Origin > Application Settings > Installs and Saves
Make sure those are set to the D drive.
You'll also have a The Sims 4 folder in your Documents, this is normal and you can't really move that one with a setting.
This is a rather old link that worked for someone to move the entire Documents folder, but I'm not sure it still works:
http://modthesims.info/wiki.php?title=Game_Help:Change_Location_of_Downloads_Folder
The explanation on how to move the Documents folder are still correct for Windows 8 but needs a little change for Windows 10. It is probably best to point to this article: https://www.windowscentral.com/how-move-default-user-folders-new-drive-windows-10
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