If you want to show cross sells on the cart page, you'll need to make sure you're using a cart of type "page" and not "drawer", "modal" or other.

This can be changed in your store's Online Store -> Themes -> Customize -> Theme Settings -> Cart -> change "cart type" to "page".

‍If you don't have this option, please contact your theme's support team for assistance, or get in touch with our partner Storetasker ->https://storetasker.com/ambassadors/Cross-Sell