Re: I have SSD C: & HDD D: | What Location to Move 1. ORIGIN and 2. SIMS 4 to?
@Sugarhigh246 It looks like Origin is already going to install Sims 4 to D, in the Origin Games folder, which is what you want. Your mods and cc are stored elsewhere though: inside your Sims 4 game folder in Documents\Electronic Arts. This folder will always be in Documents, wherever Documents is stored on your computer. If you want to move it, the easiest and safest way is to move all of Documents to your D drive. Here's how:
https://www.tenforums.com/tutorials/74952-move-location-documents-folder-windows-10-a.html
Depending on how much free storage you have on C though, this may not be necessary. Some people find that their Sims 4 game folder only takes up a few GB of space, or they move extra saves, screenshots, etc. to a backup on a secondary drive while keeping their current content inside Documents on C. Other people have 10 GB or more of custom content and need to move everything to D. It's your call which approach will work best for you.
P.S. The "legacy game installers" entry in your first screenshot doesn't matter much unless you plan to keep the installers for games after you've downloaded them. In the same screenshot, you can see that the option to keep those installers is off.