Hi,

If you want to hide the prices and add to cart for logout users then you can enable the option “Login to see add to cart and prices” from Theme Settings >> Shop >> LOGIN TO SEE PRICES.
https://ibb.co/3YtTZVt

Unfortunately, we cannot hide it with CSS. If we hide it, it would be hidden for both: logged-in and logged-out.
If you have any questions please feel free to contact us.

Best Regards.