Go to the Upsells tab to configure the cart upsells.
These are the settings you can configure:
Choose whether or not you want to show upsell offers to your visitors inside the cart.
Set the display position of your upsells from the available five style options to choose from.
You can offer either upsells, cross-sells, or both of them to your customers inside your cart.
Based on your settings, users will be able to see cart recommended items in their cart.
Specify the heading of the upsell section of your cart.
Show the number of upsells you want to display inside the cart. These offers will display in a sliding format.
Add the product you want to show as default upsells when a user adds an item to their shopping cart.
So when a user adds any item to their cart, these products will appear as default upsells.
Take a look:
Always Show Default Upsells
Enable this option if you always want your shoppers to show default upsells. This will help you to show product recommendations to your users at all times (even if the items added to their cart have no upsell or cross-sell added)
Save the changes when you're done.
Explore the Products and Upsells section here.