Hello, @buscape,
1. Cross-sells: You have to edit the product and remove the Cross-sells products from it: https://postimg.cc/TKq82Qmk and it will remove from the cart page.
2. Remove Sold Out Products: Unfortunately there is no such option in our theme or in WooCommerce for it, and there is no ready solution as well, so it is not possible with the current theme version and requires extra Customization.
Item support does not include services to modify or extend the item beyond the original features, style, and functionality described on the item page.
If you want paid Customization services submit a customization request to WPKraken team.
Regards 8Themes Team.