The short-code for cart items template is {cart_items}

You can change the template in the admin setting as shown the screenshot below

Sample preview for the cart item templates

hbacs items1

hbac items 2

hbac items 3

hbac items 4

hbac items 5

hbac items 6

hbac items 7

hbac items 8 single

hbac items 9 single

Creating you own template

To create your own template, you can add the file in the template folder

The file for these templates are located in the folder

catalog/view/theme/default/template/extension/module/oc2/abandoned_cart_items_templates/

and

catalog/view/theme/default/template/extension/module/oc3/abandoned_cart_items_templates/