Re: I can only rotate the Sim when in CAS-mode
@CozyySimmer and @superstringer If you have any files in ConfigOverride, inside Documents > Electronic Arts > The Sims 4, please remove them.
If that doesn't help, please disable any apps that come with overlays: Steam, Discord, etc. Disable the EA App in-game overlay as well; the option is under Settings > Application.
If that doesn't help either, put the game into windowed mode.
Please also let me know whether your computer runs Windows or macOS. This is the PC tech forum, so I'm writing as if dealing with Windows, but I've seen a few posts about this in macOS as well.