In the Custom Furniture interface, after you finish placing the cabinet or closet, hover the "Generate" option from the top and click "Countertop" to enter the countertop generation interface.
After entering the generation interface, select the cabinets that you want to generate the countertop for (hold down the "Shift" key to select more or deselect), and finally click "Generate" to generate the countertop. After the countertop is generated, you can adjust its basic properties like thickness, apron trim or backsplash height and elevation, as well as style properties like material in the right property panel.、