Re: Getting Sims 4 to Launch without Steam
@Jirachiking No, I meant unlink your EA and Steam accounts. This is a separate process:
https://help.ea.com/en/help/account/unlink-gaming-accounts-from-ea-account/
If the only reason you have linked accounts is for Sims 4, then there's no reason to relink them. If you do want the accounts linked for other games, you can do so after uninstalling the Steam version of Sims 4 and installing the EA App version.
Your saves and other user content are stored in Documents > Electronic Arts > The Sims 4. This folder should not be removed when you uninstall the game, but it's a good idea to make a backup copy anyway. You never know when you'll run into computer trouble, and having a backup means you won't lose everything. Ideally, you'd store the backup on an external drive, but a free cloud storage service like Google Drive would work too.